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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to outstanding options $ 3,120   $ 3,120  
Weighted average grant date fair value of vested options     $ 5.34  
Weighted average grant date fair value of shares outstanding $ 4.18   4.18  
Weighted average grant date fair value per share of employee option granted $ 1.07 $ 3.88 $ 1.42 $ 5.48
Stock-based compensation expense $ 336 $ 257 $ 647 $ 492
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost, recognition period     2 years 3 months 26 days  
Stock-based compensation expense 336 256 $ 646 490
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost, recognition period     8 months 23 days  
Unrecognized compensation cost related to restricted stock awards $ 1   $ 1  
Stock-based compensation expense   $ 1 $ 1 $ 2