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Stockholders' Equity (Details 4) (USD $)
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12 Months Ended | 1 Months Ended | ||||
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2013
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Aug. 31, 2010
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May 31, 2014
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Jun. 30, 2000
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| Shares | ||||||
| Nonvested, balance at the beginning of the period (in shares) | 2,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber | 1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber | ||||
| Nonvested, balance at the end of the period (in shares) | 1,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber | 2,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber | 1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber | |||
| Additional disclosure | ||||||
| Stock-based compensation expense | $ 2,236,000us-gaap_AllocatedShareBasedCompensationExpense | $ 2,147,000us-gaap_AllocatedShareBasedCompensationExpense | $ 1,601,000us-gaap_AllocatedShareBasedCompensationExpense | |||
| Purchase Plan | ||||||
| Additional disclosure | ||||||
| Increase in common stock available under the plan |
500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
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| Expiration term from approval of grant | 10 years | |||||
| Number of shares of common stock reserved for issuance |
1,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
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| Maximum amount that can be contributed by the employee |
25,000cpst_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumContributionByEmployeeAmount / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
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| Maximum percentage of regular compensation that can be contributed by the employee |
15.00%cpst_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumContributionByEmployeePercent / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
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| Percentage of the fair market value of common stock on the last day of the purchase right period |
95.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
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| Options granted (in shares) |
20,619us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
12,302us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
22,478us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
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| Number of shares available for future grant |
409,569us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
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| Restricted stock units | ||||||
| Shares | ||||||
| Nonvested, balance at the end of the period (in shares) |
93,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
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| Additional disclosure | ||||||
| Vesting period | 4 years | |||||
| Stock-based compensation expense |
1,048,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
914,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
558,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
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| Aggregate fair value of restricted stock units vested and issued |
1,206,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
806,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
560,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
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| Weighted average grant date fair value of options granted during the period (in dollars per share) |
$ 1.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
$ 1.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
$ 1.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
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| Unrecognized compensation cost |
1,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
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| Weighted average period for recognizing compensation cost | 2 years 1 month 6 days | |||||
| Restricted stock units | Awards vesting over four years with one-fourth units vesting one year after the issuance date | ||||||
| Additional disclosure | ||||||
| Vesting period | 1 year | |||||
| Awards vesting percentage |
25.00%cpst_VestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = cpst_AwardsVestingOverFourYearsWithOneFourthUnitsVestingOneYearAfterIssuanceDateMember |
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| Restricted stock units | Performance Restricted Stock Units | ||||||
| Shares | ||||||
| Nonvested, balance at the beginning of the period (in shares) |
2,061,224us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = cpst_PerformanceBasedRestrictedStockUnitsMember |
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| Granted (in shares) |
974,236us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = cpst_PerformanceBasedRestrictedStockUnitsMember |
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| Vested and issued (in shares) |
(828,136)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = cpst_PerformanceBasedRestrictedStockUnitsMember |
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| PRSU adjustments |
(200,000)cpst_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceRestrictedStockUnitAdjustmentsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = cpst_PerformanceBasedRestrictedStockUnitsMember |
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| Forfeited (in shares) |
(138,750)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = cpst_PerformanceBasedRestrictedStockUnitsMember |
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| Nonvested, balance at the end of the period (in shares) |
1,868,574us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = cpst_PerformanceBasedRestrictedStockUnitsMember |
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| Awards expected to vest (in shares) |
1,760,706cpst_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = cpst_PerformanceBasedRestrictedStockUnitsMember |
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| Weighted Average Grant-Date Fair Value | ||||||
| Nonvested restricted stock units outstanding at the beginning of the period (in dollars per share) |
$ 1.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = cpst_PerformanceBasedRestrictedStockUnitsMember |
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| Granted (in dollars per share) |
$ 1.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = cpst_PerformanceBasedRestrictedStockUnitsMember |
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| Vested and issued (in dollars per share) |
$ 1.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = cpst_PerformanceBasedRestrictedStockUnitsMember |
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| PRSU adjustments (in dollars per share) |
$ 1.56cpst_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceRestictedStockUnitAdjustmentsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = cpst_PerformanceBasedRestrictedStockUnitsMember |
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| Forfeited (in dollars per share) |
$ 1.14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = cpst_PerformanceBasedRestrictedStockUnitsMember |
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| Nonvested restricted stock units outstanding at the end of the period (in dollars per share) |
$ 1.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = cpst_PerformanceBasedRestrictedStockUnitsMember |
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| Awards expected to vest (in dollars per share) |
$ 1.19cpst_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = cpst_PerformanceBasedRestrictedStockUnitsMember |
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| Non-employee director | ||||||
| Weighted Average Grant-Date Fair Value | ||||||
| Granted (in dollars per share) |
$ 0.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |
$ 1.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |
$ 0.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |
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| Additional disclosure | ||||||
| Stock-based compensation expense |
117,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |
116,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |
101,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |
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| Deferred stock awards granted |
119,277us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |
91,603us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |
103,574us-gaap_StockIssuedDuringPeriodSharesIssuedForServices / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |
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| Non-employee director | Restricted stock units | ||||||
| Additional disclosure | ||||||
| Vesting period | 1 year | |||||
| Chief Executive Officer | PRSU Program | ||||||
| Shares | ||||||
| Granted (in shares) |
200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cpst_PerformanceRestrictedStockUnitProgramMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |
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| Additional disclosure | ||||||
| Stock-based compensation expense |
$ 0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = cpst_PerformanceRestrictedStockUnitProgramMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |
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| Weighted average grant date fair value of options granted during the period (in dollars per share) |
$ 1.56us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = cpst_PerformanceRestrictedStockUnitProgramMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |
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| Vesting right percentage of awards that will vest after end of applicable performance measurement period |
50.00%cpst_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentageThatWillVestAfterEndOfPerformanceMeasurementPeriod / us-gaap_AwardTypeAxis = cpst_PerformanceRestrictedStockUnitProgramMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |
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| Vesting right percentage of awards that will vest one year after end of performance measurement period |
50.00%cpst_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentageThatWillVestOneYearAfterEndOfPerformanceMeasurementPeriod / us-gaap_AwardTypeAxis = cpst_PerformanceRestrictedStockUnitProgramMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |
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| X | ||||||||||
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- Definition
Represents the vesting right percentage of awards that will vest after the end of performance measurement period. No definition available.
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| X | ||||||||||
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- Definition
Represents the vesting right percentage of awards that will vest one year after the end of performance measurement period. No definition available.
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| X | ||||||||||
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- Definition
As of the balance sheet date, the number of shares into which equity instruments other than options expected to vest and outstanding can be converted under the equity-based compensation plan. No definition available.
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| X | ||||||||||
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- Definition
As of the balance sheet date, the weighted-average grant date fair value for outstanding equity awards expected to vest, other than options. No definition available.
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| X | ||||||||||
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- Definition
The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the performance restricted stock units adjustments during reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. No definition available.
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| X | ||||||||||
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- Definition
The number of equity-based payment instruments, excluding stock (or unit) options, that are performance restricted stock unit adjustments during the reporting period. No definition available.
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| X | ||||||||||
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- Definition
Represents the maximum amount that can be contributed by the employee during the purchase right period. No definition available.
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| X | ||||||||||
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- Definition
Represents the maximum percentage of regular compensation that can be contributed by the employee during the purchase right period. No definition available.
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| X | ||||||||||
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- Definition
The period of time, from the grant date until the time at which the share-based [option] award expires. No definition available.
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| X | ||||||||||
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- Definition
Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, shown as a percentage. No definition available.
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| X | ||||||||||
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- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. No definition available.
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| X | ||||||||||
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- Definition
Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of additional shares authorized for issuance under an established share-based compensation plan. No definition available.
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| X | ||||||||||
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- Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Gross number of share options (or share units) granted during the period. No definition available.
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| X | ||||||||||
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Purchase price of common stock expressed as a percentage of its fair value. No definition available.
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| X | ||||||||||
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- Definition
Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Details
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