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Stockholders' Equity - Company's Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
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 4 months 24 days  
Aggregate Intrinsic Value (in thousands) $ 9,089  
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 4 months 24 days  
Aggregate intrinsic value (in thousands) exercisable at end of period $ 9,089  
Weighted-average contractual term outstanding 2 years 4 months 24 days 3 years 2 months 12 days
Aggregate intrinsic value (in thousands) outstanding at end of period $ 9,089  
2013 Equity Incentive Plan    
OUTSTANDING OPTIONS    
Outstanding at beginning of period 2,066,105  
Options granted 674,738  
Options exercised (32,521)  
Options forfeited (22,159)  
Outstanding at end of period 2,686,163 2,066,105
WEIGHTED-AVERAGE EXERCISE PRICE    
Outstanding at beginning of period $ 7.41  
Options granted 7.03  
Options exercised 5.96  
Options forfeited 7.35  
Outstanding at end of period $ 7.33 $ 7.41
VESTED AND EXPECTED TO VEST    
Outstanding options 2,686,163  
Weighted-Average Exercise Price $ 7.33  
Weighted-Average Remaining Contractual Term 7 years 7 months 6 days  
Aggregate Intrinsic Value (in thousands) $ 17,884  
ADDITIONAL DISCLOSURES    
Outstanding options exercisable at end of period 1,453,937  
Weighted-average exercise price exercisable at end of period $ 7.84  
Weighted-average contractual term (years) exercisable at end of period 6 years 8 months 12 days  
Aggregate intrinsic value (in thousands) exercisable at end of period $ 9,003  
Weighted-average contractual term outstanding 7 years 7 months 6 days 7 years 10 months 24 days
Aggregate intrinsic value (in thousands) outstanding at end of period $ 17,884