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Stockholders' Equity - Company's Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
2003 Stock Incentive Plan [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding Options, Beginning balance 972,860    
Outstanding Options, granted   9,297  
Outstanding Options, exercised (110,486)    
Outstanding Options, forfeited (633)    
Outstanding Options, Ending balance 861,741   972,860
Vested or expected to vest outstanding options 859,829    
Exercisable outstanding options 802,034    
Weighted-Average Exercise price, Outstanding Beginning balance $ 1.18    
Weighted-Average Exercise price, Options granted   $ 3.73  
Weighted-Average Exercise price, Options exercised $ 1.16    
Weighted-Average Exercise price, Options forfeited $ 1.12    
Weighted-Average Exercise price, Outstanding Ending balance $ 1.26   $ 1.18
Weighted-Average Exercise price, Vested or expected to vest $ 1.26    
Weighted-Average Exercise price, Exercisable $ 1.20    
Weighted-Average Remaining Contractual Term, Outstanding 5 years 8 months 12 days   7 years 2 months 9 days
Weighted-Average Remaining Contractual Term, Vested or expected to vest 5 years 8 months 12 days    
Weighted-Average Remaining Contractual Term, Exercisable 5 years 6 months 22 days    
Aggregate Intrinsic Value, Outstanding Beginning balance $ 7,000    
Aggregate Intrinsic Value, Outstanding Ending balance 6,180   7,000
Aggregate Intrinsic Value, Vested or expected to vest 6,168    
Aggregate Intrinsic Value, Exercisable 5,799    
2013 Equity Incentive Plan [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding Options, Beginning balance 0    
Outstanding Options, granted 919,188    
Outstanding Options, exercised 0    
Outstanding Options, forfeited 0    
Outstanding Options, Ending balance 919,188    
Vested or expected to vest outstanding options 893,964    
Weighted-Average Exercise price, Outstanding Beginning balance $ 0.00    
Weighted-Average Exercise price, Options granted $ 8.90    
Weighted-Average Exercise price, Outstanding Ending balance $ 8.90    
Weighted-Average Exercise price, Vested or expected to vest $ 8.90    
Weighted-Average Remaining Contractual Term, Outstanding 9 years 6 months 29 days    
Weighted-Average Remaining Contractual Term, Vested or expected to vest 9 years 3 months 22 days    
Aggregate Intrinsic Value, Outstanding Ending balance 372    
Aggregate Intrinsic Value, Vested or expected to vest $ 362