Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Restricted Stock Units and Awards (Details)

v3.8.0.1
Stockholders' Equity - Restricted Stock Units and Awards (Details) - USD ($)
12 Months Ended
Aug. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Additional disclosure      
Stock-based compensation expense   $ 586,000 $ 810,000
ESPP      
Additional disclosure      
Number of shares of common stock reserved for issuance 70,000 570,000  
Increase in common stock available under the plan 500,000    
Maximum amount that can be contributed by the employee   $ 25,000  
Maximum percentage of regular compensation that can be contributed by the employee   15.00%  
Percentage of the fair market value of common stock on the last day of the purchase right period   95.00%  
Number of shares issued under purchase plan   5,836 10,063
Number of shares available for future grant   498,921  
Restricted stock units      
Shares      
Nonvested, balance at the beginning of the period (in shares)   316,709  
Granted (in shares)   1,986,384  
Vested and issued (in shares)   (239,742)  
Forfeited (in shares)   (51,740)  
Nonvested, balance at the end of the period (in shares)   2,011,611 316,709
Awards expected to vest (in shares)   2,011,588  
Weighted Average Grant-Date Fair Value      
Nonvested restricted stock units outstanding at the beginning of the period (in dollars per share)   $ 2.85  
Granted (in dollars per share)   0.83 $ 1.64
Vested and issued (in dollars per share)   2.65  
Forfeited (in dollars per share)   1.73  
Nonvested restricted stock units outstanding at the end of the period (in dollars per share)   0.90 $ 2.85
Awards expected to vest (in dollars per share)   $ 0.90  
Additional disclosure      
Assumed forfeiture (in shares)   0  
Stock-based compensation expense   $ 566,000 $ 686,000
Aggregate fair value of restricted stock units vested and issued   157,000 $ 132,000
Unrecognized compensation cost   $ 1,500,000  
Weighted average period for recognizing compensation cost   2 years 2 months 12 days  
Restricted stock units | Awards vesting over four years with one-fourth units vesting one year after the issuance date      
Additional disclosure      
Vesting period   4 years  
Awards vesting percentage   25.00%  
Restricted Stock Awards      
Shares      
Granted (in shares)   3,969 65,167
Weighted Average Grant-Date Fair Value      
Granted (in dollars per share)   $ 0.63 $ 1.59
Additional disclosure      
Stock-based compensation expense   $ 3,000 $ 104,000
Non-employee director | Restricted stock units      
Additional disclosure      
Vesting period   1 year