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Stockholders' Equity - Company's Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended 36 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2017
2003 Stock Incentive Plan          
OUTSTANDING OPTIONS          
Outstanding at beginning of period 729,819        
Options granted 0 0     0
Options exercised (16,608) (28,368) (99,029)    
Outstanding at end of period 713,211 729,819     713,211
WEIGHTED-AVERAGE EXERCISE PRICE          
Outstanding at beginning of period $ 1.26        
Options exercised 1.65        
Outstanding at end of period $ 1.25 $ 1.26     $ 1.25
VESTED AND EXPECTED TO VEST          
Outstanding options 713,211       713,211
Weighted-Average Exercise Price $ 1.25       $ 1.25
Weighted-Average Remaining Contractual Term 2 years 2 months 12 days        
Aggregate Intrinsic Value (in thousands) $ 11,086       $ 11,086
ADDITIONAL DISCLOSURES          
Outstanding options exercisable at end of period 713,211       713,211
Weighted-average exercise price exercisable at end of period $ 1.25       $ 1.25
Weighted-average contractual term (years) exercisable at end of period 2 years 2 months 12 days        
Aggregate intrinsic value (in thousands) exercisable at end of period $ 11,086       $ 11,086
Weighted-average contractual term outstanding 2 years 2 months 12 days 3 years 2 months 12 days      
Aggregate intrinsic value (in thousands) outstanding at end of period $ 11,086       $ 11,086
2013 Equity Incentive Plan          
OUTSTANDING OPTIONS          
Outstanding at beginning of period 2,066,105        
Options granted 674,738        
Options exercised (54,521) (3,500) 0 0  
Options forfeited (22,159)        
Outstanding at end of period 2,664,163 2,066,105     2,664,163
WEIGHTED-AVERAGE EXERCISE PRICE          
Outstanding at beginning of period $ 7.41        
Options granted 7.03        
Options exercised 6.35        
Options forfeited 7.35        
Outstanding at end of period $ 7.34 $ 7.41     $ 7.34
VESTED AND EXPECTED TO VEST          
Outstanding options 2,664,163       2,664,163
Weighted-Average Exercise Price $ 7.34       $ 7.34
Weighted-Average Remaining Contractual Term 7 years 4 months 24 days        
Aggregate Intrinsic Value (in thousands) $ 25,091       $ 25,091
ADDITIONAL DISCLOSURES          
Outstanding options exercisable at end of period 1,569,935       1,569,935
Weighted-average exercise price exercisable at end of period $ 7.81       $ 7.81
Weighted-average contractual term (years) exercisable at end of period 6 years 6 months        
Aggregate intrinsic value (in thousands) exercisable at end of period $ 14,079       $ 14,079
Weighted-average contractual term outstanding 7 years 4 months 24 days 7 years 10 months 24 days      
Aggregate intrinsic value (in thousands) outstanding at end of period $ 25,091       $ 25,091