Quarterly report pursuant to Section 13 or 15(d)

Description of Stock Plans - Narrative (Details)

v3.10.0.1
Description of Stock Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Weighted average grant-date fair value (in dollars per share) $ 1.64 $ 1.17 $ 1.64 $ 1.17  
Total unrecognized stock base compensation expense $ 2,194 $ 2,691 $ 2,194 $ 2,691  
Unvested stock options, weighted average period     2 years 5 days 2 years 14 days  
Allocated stock compensation expense $ 631 $ 849 $ 1,781 $ 2,359  
Maximum          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Option plan, term     10 years    
Equity Option          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Granted (in shares)     1,349,925 1,338,778  
Forfeitures/cancellations (in shares)     1,239,335    
Restricted Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Awarded (in shares)     539,213    
Stock Option Plan 2011          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Reserved for future issuance (in shares) 20,000,000   20,000,000    
Available for issuance (in shares) 8,485,711   8,485,711   9,135,513
Stock Incentive Plans | Minimum          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Option plan, term     3 years    
Stock Incentive Plans | Maximum          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Option plan, term     4 years