Quarterly report pursuant to Section 13 or 15(d)

Description of Stock Plans (Details)

v3.8.0.1
Description of Stock Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Weighted average grant-date fair value (in dollars per share) $ 1.06 $ 0.82 $ 1.06 $ 0.82  
Total unrecognized stock base compensation expense $ 3,254 $ 6,731 $ 3,254 $ 6,731  
Unvested stock options, weighted average period     2 years 7 days 2 years 3 months 21 days  
Allocated stock compensation expense $ 765 $ 1,173 $ 1,629 $ 2,476  
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)     872,000 1,037,000  
Forfeitures/cancellations (shares)     (757,934)    
Restricted Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Awarded (in shares)     265,138    
Restricted Stock | Minimum          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Vesting period     3 months    
Restricted Stock | Maximum          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Vesting period     2 years    
Employee Stock Option | Appia Core          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Vesting period     4 years    
Expiration period     10 years    
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) 9,285,919   9,285,919   9,665,123
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