Annual report pursuant to Section 13 and 15(d)

Capital Stock Transactions - Additional Information (Detail)

v3.20.1
Capital Stock Transactions - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Sep. 20, 2017
Sep. 30, 2016
Sep. 28, 2016
Class Of Stock [Line Items]            
Series A convertible preferred stock, shares authorized (in shares) 2,000,000 2,000,000        
Series A convertible preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001        
Series A convertible preferred stock, shares issued (in shares) 100,000 100,000        
Warrant exercise price (in dollars per share)         $ 1.364  
Total unrecognized stock base compensation expense $ 4,787 $ 2,639 $ 2,353      
Unvested stock options, weighted average period 2 years 3 months 10 days 1 year 11 months 10 days 2 years 2 months 12 days      
Initial Purchaser Of Warrants            
Class Of Stock [Line Items]            
Number of securities called by warrant (in shares)         250,000  
Holder Of Notes            
Class Of Stock [Line Items]            
Number of securities called by warrant (in shares)         4,105,600  
Convertible Notes Payable            
Class Of Stock [Line Items]            
Shares converted (in shares) 0 4,446,265        
Number of securities called by warrant (in shares) 4,105,600         250,000
Warrant exercise price (in dollars per share)       $ 1.364    
Stock Option            
Class Of Stock [Line Items]            
Options exercised (in shares) 2,279,747 524,817        
Warrant liability            
Class Of Stock [Line Items]            
Options exercised (in shares) 3,283,090 333,924        
Restricted Stock            
Class Of Stock [Line Items]            
Shares issued for service, vesting period 1 year          
Number of shares granted (in shares) 184,910          
Restricted Stock | Minimum            
Class Of Stock [Line Items]            
Shares issued for service, vesting period 3 months          
Restricted Stock | Maximum            
Class Of Stock [Line Items]            
Shares issued for service, vesting period 2 years          
Time Based Restricted Stock Awards            
Class Of Stock [Line Items]            
Number of shares granted (in shares) 75,493 306,655        
Compensation expense $ 424 $ 380 $ 323      
Non Vested Restricted Stock            
Class Of Stock [Line Items]            
Number of shares granted (in shares) 75,494 306,655        
Number of restricted shares, unvested (in shares) 37,746 153,328 132,569      
Number of shares vested (in shares) 191,076 285,896        
Total unrecognized stock base compensation expense $ 140 $ 144        
Unvested stock options, weighted average period 4 months 1 day 4 months 1 day        
RSU Agreement            
Class Of Stock [Line Items]            
Number of restricted shares, unvested (in shares) 109,416 232,558        
Number of shares vested (in shares) 67,830          
Convertible Preferred Stock            
Class Of Stock [Line Items]            
Series A convertible preferred stock, shares authorized (in shares) 2,000,000          
Series A convertible preferred stock, par value (in dollars per share) $ 0.0001          
Series A convertible preferred stock, shares issued (in shares) 100,000          
Convertible into (in shares) 20,000          
Liquidation preference, per shares (in dollars per share) $ 10