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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, 2016
Sep. 30, 2015
Dec. 31, 2015
OUTSTANDING OPTIONS      
Options exercised   0  
2003 Stock Incentive Plan      
OUTSTANDING OPTIONS      
Outstanding at beginning of period 758,187    
Options exercised (27,268)    
Outstanding at end of period 730,919   758,187
WEIGHTED-AVERAGE EXERCISE PRICE      
Outstanding at beginning of period $ 1.27    
Options exercised 1.49    
Outstanding at end of period $ 1.26   $ 1.27
VESTED AND EXPECTED TO VEST      
Outstanding options 730,888    
Weighted-Average Exercise Price $ 1.26    
Weighted-Average Remaining Contractual Term 3 years 6 months    
Aggregate Intrinsic Value (in thousands) $ 4,306    
ADDITIONAL DISCLOSURES      
Outstanding options exercisable at end of period 729,565    
Weighted-average exercise price exercisable at end of period $ 1.25    
Weighted-average contractual term (years) exercisable at end of period 3 years 6 months    
Aggregate intrinsic value (in thousands) exercisable at end of period $ 4,301    
Weighted-average contractual term outstanding 3 years 6 months   4 years 2 months 12 days
Aggregate intrinsic value (in thousands) outstanding at end of period $ 4,306    
2013 Equity Incentive Plan      
OUTSTANDING OPTIONS      
Outstanding at beginning of period 1,470,338    
Options granted 618,250    
Options exercised (3,500)    
Options forfeited (22,591)    
Outstanding at end of period 2,062,497   1,470,338
WEIGHTED-AVERAGE EXERCISE PRICE      
Outstanding at beginning of period $ 8.26    
Options granted 5.35    
Options exercised 7.95    
Options forfeited 6.20    
Outstanding at end of period $ 7.41   $ 8.26
VESTED AND EXPECTED TO VEST      
Outstanding options 2,053,321    
Weighted-Average Exercise Price $ 7.41    
Weighted-Average Remaining Contractual Term 8 years 2 months 12 days    
Aggregate Intrinsic Value (in thousands) $ 1,100    
ADDITIONAL DISCLOSURES      
Outstanding options exercisable at end of period 828,814    
Weighted-average exercise price exercisable at end of period $ 8.26    
Weighted-average contractual term (years) exercisable at end of period 7 years 8 months 12 days    
Aggregate intrinsic value (in thousands) exercisable at end of period $ 1    
Aggregate intrinsic value (in thousands) outstanding at end of period $ 1,110