Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - 2000 Equity Incentive Plan and 2017 Equity Incentive Plan (Details)

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Stock-Based Compensation - 2000 Equity Incentive Plan and 2017 Equity Incentive Plan (Details)
6 Months Ended
Sep. 30, 2017
shares
2000 Equity Incentive Plan and 2017 Equity Incentive Plan | Stock options  
Stockholders' equity  
Vesting period 4 years
Expiration Term 10 years
Assumed stock option forfeitures (in shares) 0
Portion vesting one year after the issuance date (as a percent) 25.00%
Vesting period after one year of grant 1 year
Portion vesting on first day of each month after one year from the issuance date (as a percent) 2.083%
Vesting period of awards after issuance date 48 months
2000 Plan  
Stockholders' equity  
Number of shares of common stock reserved for issuance 1,849,000
2017 Plan  
Stockholders' equity  
Number of shares of common stock reserved for issuance 3,000,000