Annual report pursuant to Section 13 and 15(d)

Capital Stock Transactions - Additional Information (Detail)

v3.19.1
Capital Stock Transactions - Additional Information (Detail) - USD ($)
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
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  
Stock-based compensation for services rendered $ 520,000 $ 323,000 $ 398,000      
Common stock, issued (in shares) 82,354,940 76,843,278        
Total unrecognized stock base compensation expense $ 2,639,000 $ 2,353,000 $ 5,038,000      
Unvested stock options, weighted average period 1 year 11 months 10 days 2 years 2 months 12 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) 4,446,265 8,624,445        
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) 524,817 258,281        
Options Granted For Services Rendered            
Class Of Stock [Line Items]            
Options exercised (in shares) 0 100,000        
Warrant liability            
Class Of Stock [Line Items]            
Options exercised (in shares) 333,924 256,600        
Stock-based compensation for services rendered $ 0 $ 28,000        
Warrants Not Settleable in Cash            
Class Of Stock [Line Items]            
Options exercised (in shares) 0 9,552        
Previously Issued Warrants            
Class Of Stock [Line Items]            
Options exercised (in shares)   30,000        
Restricted Stock            
Class Of Stock [Line Items]            
Shares issued for service, vesting period 1 year          
Number of shares granted (in shares) 539,213          
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) 306,655 265,138        
Compensation expense $ 520,000 $ 323,000 $ 398,000      
Non Vested Restricted Stock            
Class Of Stock [Line Items]            
Number of shares granted (in shares) 306,655 265,138        
Number of restricted shares, unvested (in shares) 153,328 132,569 139,318      
Number of shares vested (in shares) 285,896 271,887        
Total unrecognized stock base compensation expense $ 144,000 $ 97,000        
Unvested stock options, weighted average period 4 months 1 day 4 months        
RSU Agreement            
Class Of Stock [Line Items]            
Number of shares granted (in shares) 0          
Number of restricted shares, unvested (in shares) 232,558          
Number of shares vested (in shares) 0          
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