Annual report pursuant to Section 13 and 15(d)

Capital Stock Transactions - Additional Information (Detail)

v3.8.0.1
Capital Stock Transactions - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Aug. 31, 2016
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
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   $ 323 $ 398 $ 867    
Total unrecognized stock base compensation expense   $ 2,353 $ 5,038 $ 9,377    
Unvested stock options, weighted average period   2 years 2 months 12 days 2 years 2 months 12 days 2 years 7 months 24 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)   8,624,445 0      
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)   258,281 (18,383)      
Options Granted For Services Rendered            
Class Of Stock [Line Items]            
Options exercised (in shares)   100,000 0      
Warrant liability            
Class Of Stock [Line Items]            
Options exercised (in shares)   256,600 0      
Stock-based compensation for services rendered   $ 28 $ 19      
Warrants Not Settleable in Cash            
Class Of Stock [Line Items]            
Options exercised (in shares)   9,552        
Previously Issued Warrants            
Class Of Stock [Line Items]            
Options exercised (in shares)   30,000        
Restricted Stock            
Class Of Stock [Line Items]            
Number of shares issued (in shares)   265,138        
Shares issued for service, vesting period 1 year          
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 issued (in shares)   265,138 331,363      
Number of shares canceled (in shares)   0 39,545      
Compensation expense   $ 294 $ 398 $ 867    
Non Vested Restricted Stock            
Class Of Stock [Line Items]            
Number of shares issued (in shares)   265,138 331,363      
Number of shares canceled (in shares)   0 39,545      
Number of restricted shares, unvested (in shares)   132,569 139,318 110,046    
Total unrecognized stock base compensation expense   $ 97 $ 103      
Unvested stock options, weighted average period   4 months 4 months      
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