Quarterly report pursuant to Section 13 or 15(d)

Description of Stock Plans (Details)

v3.10.0.1
Description of Stock Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 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) $ 1.67 $ 1.06 $ 1.67 $ 1.06  
Total unrecognized stock base compensation expense $ 3,417 $ 3,254 $ 3,417 $ 3,254  
Unvested stock options, weighted average period     2 years 2 months 22 days 2 years 9 days  
Allocated stock compensation expense $ 602 $ 719 $ 1,150 $ 1,510  
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]          
Grants (shares)     1,240,425 872,000  
Forfeitures/cancellations (shares)     964,863    
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) 8,320,739   8,320,739   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