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Stockholders' Equity - Company's Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
2003 Stock Incentive Plan    
Stock option activity    
Outstanding Options, Beginning balance 758,187  
Outstanding Options, exercised (23,986)  
Outstanding Options, Ending balance 734,201 758,187
Vested or expected to vest outstanding options 734,066  
Exercisable outstanding options 729,317  
Weighted-Average Exercise price, Outstanding Beginning balance $ 1.27  
Weighted-Average Exercise price, Options exercised 1.50  
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 4 years 4 years 2 months 12 days
Weighted-Average Remaining Contractual Term, Exercisable 3 years 10 months 24 days  
Weighted-Average Remaining Contractual Term, Vested or expected to vest 4 years  
Aggregate Intrinsic Value, Outstanding Ending balance $ 3,451  
Aggregate Intrinsic Value, Vested or expected to vest 3,450  
Aggregate Intrinsic Value, Exercisable $ 3,435  
2013 Equity Incentive Plan    
Stock option activity    
Outstanding Options, Beginning balance 1,470,338  
Outstanding Options, granted 528,800  
Outstanding Options, Ending balance 1,999,138 1,470,338
Vested or expected to vest outstanding options 1,988,448  
Exercisable outstanding options 615,819  
Weighted-Average Exercise price, Outstanding Beginning balance $ 8.26  
Weighted-Average Exercise price, Options granted 5.11  
Weighted-Average Exercise price, Outstanding Ending balance 7.43 $ 8.26
Weighted-Average Exercise price, Vested or expected to vest 7.43  
Weighted-Average Exercise price, Exercisable $ 8.32  
Weighted-Average Remaining Contractual Term 8 years 7 months 6 days 8 years 6 months
Weighted-Average Remaining Contractual Term, Exercisable 8 years 1 month 6 days  
Weighted-Average Remaining Contractual Term, Vested or expected to vest 8 years 7 months 6 days  
Aggregate Intrinsic Value, Outstanding Ending balance $ 449  
Aggregate Intrinsic Value, Vested or expected to vest $ 444