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Stockholders' Equity - Company's Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
OUTSTANDING OPTIONS      
Options exercised   0  
2003 Stock Incentive Plan      
OUTSTANDING OPTIONS      
Outstanding at beginning of period 729,819    
Options exercised (1,680)    
Outstanding at end of period 728,139   729,819
WEIGHTED-AVERAGE EXERCISE PRICE      
Outstanding at beginning of period $ 1.26    
Options exercised 3.26    
Outstanding at end of period $ 1.25   $ 1.26
VESTED AND EXPECTED TO VEST      
Outstanding options 728,139    
Weighted-Average Exercise Price $ 1.25    
Weighted-Average Remaining Contractual Term 3 years    
Aggregate Intrinsic Value (in thousands) $ 3,043    
ADDITIONAL DISCLOSURES      
Outstanding options exercisable at end of period 728,139    
Weighted-average exercise price exercisable at end of period $ 1.25    
Weighted-average contractual term (years) exercisable at end of period 3 years    
Aggregate intrinsic value (in thousands) exercisable at end of period $ 3,043    
Weighted-average contractual term outstanding 3 years   3 years 2 months 12 days
Aggregate intrinsic value (in thousands) outstanding at end of period $ 3,043    
2013 Equity Incentive Plan      
OUTSTANDING OPTIONS      
Outstanding at beginning of period 2,066,105    
Options granted 592,638    
Options forfeited (967)    
Outstanding at end of period 2,657,776   2,066,105
WEIGHTED-AVERAGE EXERCISE PRICE      
Outstanding at beginning of period $ 7.41    
Options granted 6.20    
Options forfeited 7.66    
Outstanding at end of period $ 7.14   $ 7.41
VESTED AND EXPECTED TO VEST      
Outstanding options 2,657,776    
Weighted-Average Exercise Price $ 7.14    
Weighted-Average Remaining Contractual Term 8 years 2 months 12 days    
Aggregate Intrinsic Value (in thousands) $ 172    
ADDITIONAL DISCLOSURES      
Outstanding options exercisable at end of period 1,135,811    
Weighted-average exercise price exercisable at end of period $ 7.85    
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 $ 50    
Weighted-average contractual term outstanding 8 years 2 months 12 days   7 years 10 months 24 days
Aggregate intrinsic value (in thousands) outstanding at end of period $ 172