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Stockholders' Equity - Company's Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
2003 Stock Incentive Plan      
OUTSTANDING OPTIONS      
Outstanding at beginning of period 758,187    
Options granted 0.00 0.00 0.00
Options exercised (28,368) (99,029) (114,836)
Outstanding at end of period 729,819 758,187  
WEIGHTED-AVERAGE EXERCISE PRICE      
Outstanding at beginning of period $ 1.27    
Options exercised 1.58    
Outstanding at end of period $ 1.26 $ 1.27  
VESTED AND EXPECTED TO VEST      
Outstanding options 729,801    
Weighted-Average Exercise Price $ 1.26    
Weighted-Average Remaining Contractual Term 3 years 2 months 12 days    
Aggregate Intrinsic Value (in thousands) $ 3,536    
ADDITIONAL DISCLOSURES      
Outstanding options exercisable at end of period 729,240    
Weighted-average exercise price exercisable at end of period $ 1.25    
Weighted-average contractual term (years) exercisable at end of period 3 years 2 months 12 days    
Aggregate intrinsic value (in thousands) exercisable at end of period $ 3,534    
Weighted-average contractual term outstanding 3 years 2 months 12 days 4 years 2 months 12 days  
Aggregate intrinsic value (in thousands) outstanding at end of period $ 3,536    
2013 Equity Incentive Plan      
OUTSTANDING OPTIONS      
Outstanding at beginning of period 1,470,338    
Options granted 627,250    
Options exercised (3,500) 0 0
Options forfeited (27,983)    
Outstanding at end of period 2,066,105 1,470,338  
WEIGHTED-AVERAGE EXERCISE PRICE      
Outstanding at beginning of period $ 8.26    
Options granted 5.36    
Options exercised 7.95    
Options forfeited 6.28    
Outstanding at end of period $ 7.41 $ 8.26  
VESTED AND EXPECTED TO VEST      
Outstanding options 2,057,409    
Weighted-Average Exercise Price $ 7.41    
Weighted-Average Remaining Contractual Term 7 years 10 months 24 days    
Aggregate Intrinsic Value (in thousands) $ 500    
ADDITIONAL DISCLOSURES      
Outstanding options exercisable at end of period 910,202    
Weighted-average exercise price exercisable at end of period $ 8.26    
Weighted-average contractual term (years) exercisable at end of period 7 years 4 months 24 days    
Aggregate intrinsic value (in thousands) exercisable at end of period $ 1    
Weighted-average contractual term outstanding 7 years 10 months 24 days 8 years 6 months  
Aggregate intrinsic value (in thousands) outstanding at end of period $ 505