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Stockholders' Equity - Company's Stock Option Activity (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
2003 Stock Incentive Plan [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding Options granted     
Weighted Average Exercise price, Outstanding Beginning balance   $ 1.18
Outstanding Options exercised     
Aggregate Intrinsic Value, Outstanding Beginning balance   $ 7,000
Outstanding Options forfeited 211  
Outstanding Options Beginning balance   972,860
Outstanding Options Ending balance 972,649  
Vested or expected to vest outstanding options 970,369  
Exercisable outstanding options 901,671  
Weighted Average Exercise price, Options forfeited $ 1.12  
Weighted Average Exercise price, Outstanding Ending balance $ 1.15  
Weighted Average Exercise price, Vested or expected to vest $ 1.15  
Weighted Average Exercise price, Exercisable $ 1.13  
Weighted Average Remaining Contractual Term, Outstanding 5 years 10 months 28 days 7 years 2 months 9 days
Weighted Average Remaining Contractual Term, Vested or expected to vest 5 years 10 months 28 days  
Weighted Average Remaining Contractual Term, Exercisable 5 years 9 months  
Aggregate Intrinsic Value, Outstanding Ending balance 14,767,000  
Aggregate Intrinsic Value, Vested or expected to vest 14,733,000  
Aggregate Intrinsic Value, Exercisable 13,706,000  
2013 Equity Incentive Plan [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding Options granted 756,537  
Weighted Average Exercise price, Outstanding Beginning balance     
Outstanding Options exercised     
Aggregate Intrinsic Value, Outstanding Beginning balance     
Outstanding Options forfeited     
Outstanding Options Beginning balance     
Outstanding Options Ending balance 756,537  
Weighted Average Exercise price, Options granted $ 8.00  
Vested or expected to vest outstanding options 734,492  
Exercisable outstanding options     
Weighted Average Exercise price, Outstanding Ending balance $ 8.00  
Weighted Average Exercise price, Vested or expected to vest $ 8.00  
Weighted Average Remaining Contractual Term, Outstanding 9 years 9 months 11 days   
Weighted Average Remaining Contractual Term, Vested or expected to vest 9 years 5 months 27 days  
Weighted Average Remaining Contractual Term, Exercisable     
Aggregate Intrinsic Value, Outstanding Ending balance 6,302,000  
Aggregate Intrinsic Value, Vested or expected to vest 6,118,000  
Aggregate Intrinsic Value, Exercisable