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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, 2017
Jun. 30, 2016
Dec. 31, 2016
2003 Stock Incentive Plan      
OUTSTANDING OPTIONS      
Outstanding at beginning of period 729,819    
Options exercised (16,608)    
Outstanding at end of period 713,211   729,819
WEIGHTED-AVERAGE EXERCISE PRICE      
Outstanding at beginning of period $ 1.26    
Options exercised 1.65    
Outstanding at end of period $ 1.25   $ 1.26
VESTED AND EXPECTED TO VEST      
Outstanding options 713,211    
Weighted-Average Exercise Price $ 1.25    
Weighted-Average Remaining Contractual Term 2 years 8 months 12 days    
Aggregate Intrinsic Value (in thousands) $ 7,070    
ADDITIONAL DISCLOSURES      
Outstanding options exercisable at end of period 713,211    
Weighted-average exercise price exercisable at end of period $ 1.25    
Weighted-average contractual term (years) exercisable at end of period 2 years 8 months 12 days    
Aggregate intrinsic value (in thousands) exercisable at end of period $ 7,070    
Weighted-average contractual term outstanding 2 years 8 months 12 days   3 years 2 months 12 days
Aggregate intrinsic value (in thousands) outstanding at end of period $ 7,070    
2013 Equity Incentive Plan      
OUTSTANDING OPTIONS      
Outstanding at beginning of period 2,066,105    
Options granted 669,638    
Options exercised (11,079) 0  
Options forfeited (17,067)    
Outstanding at end of period 2,707,597   2,066,105
WEIGHTED-AVERAGE EXERCISE PRICE      
Outstanding at beginning of period $ 7.41    
Options granted 7.01    
Options exercised 6.34    
Options forfeited 7.34    
Outstanding at end of period $ 7.32   $ 7.41
VESTED AND EXPECTED TO VEST      
Outstanding options 2,707,597    
Weighted-Average Exercise Price $ 7.32    
Weighted-Average Remaining Contractual Term 7 years 9 months 18 days    
Aggregate Intrinsic Value (in thousands) $ 10,938    
ADDITIONAL DISCLOSURES      
Outstanding options exercisable at end of period 1,359,958    
Weighted-average exercise price exercisable at end of period $ 7.85    
Weighted-average contractual term (years) exercisable at end of period 6 years 10 months 24 days    
Aggregate intrinsic value (in thousands) exercisable at end of period $ 4,843    
Weighted-average contractual term outstanding 7 years 9 months 18 days   7 years 10 months 24 days
Aggregate intrinsic value (in thousands) outstanding at end of period $ 10,938