Annual report pursuant to Section 13 and 15(d)

Description of Stock Plans - Additional Information (Detail)

v3.20.1
Description of Stock Plans - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
May 31, 2019
Jun. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
May 23, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Forfeited/Canceled (in shares)     489,785      
Allocated Stock compensation expense     $ 3,353,000 $ 2,531,000 $ 2,978,000  
Expiration period     10 years      
Weighted average grant date fair value (in dollars per share)     $ 2.86 $ 1.02 $ 0.94  
Total unrecognized stock base compensation expense     $ 4,787,000 $ 2,639,000 $ 2,353,000  
Unvested stock options, weighted average period     2 years 3 months 10 days 1 year 11 months 10 days 2 years 2 months 12 days  
Stock Option            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Granted (in shares)     2,624,244 1,463,925 1,963,378  
Forfeited/Canceled (in shares)     488,952 1,552,192    
Restricted Stock            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares granted (in shares)     184,910      
Shares issued for service, vesting period     1 year      
Restricted Stock | Minimum            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Shares issued for service, vesting period     3 months      
Restricted Stock | Maximum            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Shares issued for service, vesting period     2 years      
RSU            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares granted (in shares) 109,416 232,558        
Shares issued for service, vesting period 3 years 3 years        
Fair value $ 413,000 $ 400,000        
Allocated Stock compensation expense     $ 220,000 $ 140,000 $ 0  
Stock Option Plan 2011            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Reserved for future issuance (in shares)           20,000,000
Available for issuance (in shares)     6,366,088 8,685,457    
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