v3.3.1.900
Stockholders' Equity - Summary of Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Shares, Outstanding, Beginning balance 980,000    
Shares, Granted 315,000    
Shares, Exercised (30,000) (174,000) 0
Shares, Forfeited (8,000)    
Shares, Outstanding, Ending balance 1,257,000 980,000  
Shares, Vested and expected to vest 1,179,000    
Shares, Exercisable, Ending balance 807,000    
Wtd. Avg. Exercise Price Outstanding, Beginning balance $ 0.85    
Wtd. Avg. Exercise Price, Granted 1.61    
Wtd. Avg. Exercise Price, Exercised 0.89    
Wtd. Avg. Exercise Price, Forfeited 1.31    
Wtd. Avg. Exercise Price, Outstanding, Ending balance 1.04 $ 0.85  
Wtd. Avg. Exercise Price, Vested and expected to vest 1.00    
Wtd. Avg. Exercise Price, Exercisable, Ending balance $ 0.77    
Wtd. Avg. Remaining Contractual Life, Outstanding 4 years 6 months 4 days    
Wtd. Avg. Remaining Contractual Life, Vested and expected to vest 4 years 4 months 24 days    
Wtd. Avg. Remaining Contractual Life, Exercisable 3 years 4 months 17 days    
Aggregate Intrinsic Value, Outstanding $ 708    
Aggregate Intrinsic Value, Vested and expected to vest 699    
Aggregate Intrinsic Value, Exercisable $ 656