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Stockholders' Equity - Company's Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
2003 Stock Incentive Plan    
Stock option activity    
Outstanding Options, Beginning balance 758,187  
Outstanding Options, exercised (25,836)  
Outstanding Options, Ending balance 732,351 758,187
Vested or expected to vest outstanding options 732,308  
Exercisable outstanding options 730,354  
Weighted-Average Exercise price, Outstanding Beginning balance $ 1.27  
Weighted-Average Exercise price, Options exercised 1.47  
Weighted-Average Exercise price, Outstanding Ending balance 1.26 $ 1.27
Weighted-Average Exercise price, Vested or expected to vest 1.26  
Weighted-Average Exercise price, Exercisable $ 1.25  
Weighted-Average Remaining Contractual Term 3 years 8 months 12 days 4 years 2 months 12 days
Weighted-Average Remaining Contractual Term, Exercisable 3 years 8 months 12 days  
Weighted-Average Remaining Contractual Term, Vested or expected to vest 3 years 8 months 12 days  
Aggregate Intrinsic Value, Outstanding Ending balance $ 4,401  
Aggregate Intrinsic Value, Vested or expected to vest 4,401  
Aggregate Intrinsic Value, Exercisable $ 4,394  
2013 Equity Incentive Plan    
Stock option activity    
Outstanding Options, Beginning balance 1,470,338  
Outstanding Options, granted 608,150  
Outstanding Options, forfeited (12,800)  
Outstanding Options, Ending balance 2,065,688 1,470,338
Vested or expected to vest outstanding options 2,055,858  
Exercisable outstanding options 695,045  
Weighted-Average Exercise price, Outstanding Beginning balance $ 8.26  
Weighted-Average Exercise price, Options granted 5.31  
Weighted-Average Exercise price, Options forfeited 6.20  
Weighted-Average Exercise price, Outstanding Ending balance 7.41 $ 8.26
Weighted-Average Exercise price, Vested or expected to vest 7.41  
Weighted-Average Exercise price, Exercisable $ 8.33  
Weighted-Average Remaining Contractual Term 8 years 4 months 24 days 8 years 6 months
Weighted-Average Remaining Contractual Term, Exercisable 7 years 9 months 18 days  
Weighted-Average Remaining Contractual Term, Vested or expected to vest 8 years 4 months 24 days  
Aggregate Intrinsic Value, Outstanding Ending balance $ 1,248  
Aggregate Intrinsic Value, Vested or expected to vest 1,237  
Aggregate Intrinsic Value, Exercisable $ 20