Quarterly report pursuant to Section 13 or 15(d)

Capital Stock Transactions (Detail)

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Capital Stock Transactions (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Jun. 30, 2016
Apr. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2016
Class Of Stock [Line Items]          
Series A convertible preferred stock authorized (in shares) 2,000,000   2,000,000   2,000,000
Series A convertible preferred stock issued (in shares) 100,000   100,000   100,000
Series A convertible preferred stock, par value (in usd per share) $ 0.0001   $ 0.0001   $ 0.0001
Common stock issued upon exercise of options (in shares) 3,282 930      
Total unrecognized stock base compensation expense $ 8,103   $ 8,103 $ 10,781  
Unvested stock options, weighted average period     2 years 5 months 16 days 2 years 5 months 23 days  
Time Condition RSAs          
Class Of Stock [Line Items]          
Compensation expense     $ 80 $ 327  
Non Vested Restricted Stock          
Class Of Stock [Line Items]          
Total unrecognized stock base compensation expense $ 67   $ 67    
Unvested stock options, weighted average period     1 month 2 days    
Minimum | Restricted Stock          
Class Of Stock [Line Items]          
Vesting period     3 months    
Maximum | Restricted Stock          
Class Of Stock [Line Items]          
Vesting period     2 years    
Convertible Preferred Stock          
Class Of Stock [Line Items]          
Series A convertible preferred stock authorized (in shares) 2,000,000   2,000,000    
Series A convertible preferred stock issued (in shares) 100,000   100,000    
Aggregate shares upon conversion (shares)     20,000    
Series A convertible preferred stock, par value (in usd per share) $ 0.0001   $ 0.0001    
Liquidation preference ($ per share) $ 10   $ 10