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 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 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) $ 1.17 $ 0.64 $ 1.17 $ 0.64  
Total unrecognized stock base compensation expense $ 2,691 $ 5,706 $ 2,691 $ 5,706  
Unvested stock options, weighted average period     2 years 14 days 2 years 3 months 7 days  
Allocated stock compensation expense $ 891 $ 1,118 $ 2,520 $ 3,611  
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)     1,338,778 1,525,500  
Forfeitures/cancellations (shares)     972,299    
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) 9,033,506   9,033,506   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