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Stockholders' Equity - Activities Under Equity Plan (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
2012 Equity Plan        
Share-based Compensation Arrangement By Share-based Payment Award, Shares Authorized [Roll Forward]        
Total securities available at January 1, 2017     1,246,939  
Total securities available at September 30, 2017 1,021,445   1,021,445  
ESPP        
Share-based Compensation Arrangement By Share-based Payment Award, Shares Authorized [Roll Forward]        
Total securities available at January 1, 2017     246,039  
Less: stock purchased by eligible employees, net of forfeitures (shares) 0 0 8,983 0
Total securities available at September 30, 2017 237,056   237,056  
Restricted Stock Units | 2012 Equity Plan        
Share-based Compensation Arrangement By Share-based Payment Award, Shares Authorized [Roll Forward]        
Less: Restricted stock awarded to eligible employees, net of forfeitures (shares)     122,629  
Eligible Employees | Restricted Stock Units | 2012 Equity Plan        
Share-based Compensation Arrangement By Share-based Payment Award, Shares Authorized [Roll Forward]        
Less: Restricted stock awarded to eligible employees, net of forfeitures (shares)     87,594  
Board Of Directors | Restricted Stock | 2012 Equity Plan        
Share-based Compensation Arrangement By Share-based Payment Award, Shares Authorized [Roll Forward]        
Less: Restricted stock awarded to eligible employees, net of forfeitures (shares)     15,271