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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, 2015
Dec. 31, 2014
2003 Stock Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding Options, Beginning balance 857,391  
Outstanding Options, exercised (79,295)  
Outstanding Options, Ending balance 778,096 857,391
Vested or expected to vest outstanding options 777,331  
Exercisable outstanding options 753,554  
Weighted-Average Exercise Price, Outstanding Beginning balance $ 1.26  
Weighted-Average Exercise Price, Options exercised 1.14  
Weighted-Average Exercise Price, Outstanding Ending balance 1.27 $ 1.26
Weighted-Average Exercise Price, Vested or expected to vest 1.27  
Weighted-Average Exercise Price, Exercisable $ 1.24  
Weighted-Average Remaining Contractual Term, Outstanding 4 years 8 months 27 days 5 years 2 months 12 days
Weighted-Average Remaining Contractual Term, Vested or expected to vest 4 years 8 months 23 days  
Weighted-Average Remaining Contractual Term, Exercisable 4 years 8 months 1 day  
Aggregate Intrinsic Value, Outstanding Beginning balance $ 5,096  
Aggregate Intrinsic Value, Outstanding Ending balance 5,199 $ 5,096
Aggregate Intrinsic Value, Vested or expected to vest 5,195  
Aggregate Intrinsic Value, Exercisable $ 5,060  
2013 Equity Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding Options, Beginning balance 949,589  
Outstanding Options, granted 499,900  
Outstanding Options, forfeited (29,584)  
Outstanding Options, Ending balance 1,419,905 949,589
Vested or expected to vest outstanding options 1,412,665  
Exercisable outstanding options 281,997  
Weighted-Average Exercise Price, Outstanding Beginning balance $ 8.88  
Weighted-Average Exercise Price, Options granted 7.20  
Weighted-Average Exercise Price, Options forfeited 7.71  
Weighted-Average Exercise Price, Outstanding Ending balance 8.31 $ 8.88
Weighted-Average Exercise Price, Vested or expected to vest 8.30  
Weighted-Average Exercise Price, Exercisable $ 8.75  
Weighted-Average Remaining Contractual Term, Outstanding 8 years 11 months 1 day 9 years 1 month 2 days
Weighted-Average Remaining Contractual Term, Vested or expected to vest 8 years 11 months 1 day  
Weighted-Average Remaining Contractual Term, Exercisable 8 years 6 months 22 days  
Aggregate Intrinsic Value, Outstanding Beginning balance $ 12  
Aggregate Intrinsic Value, Outstanding Ending balance 386 $ 12
Aggregate Intrinsic Value, Vested or expected to vest 383  
Aggregate Intrinsic Value, Exercisable $ 1