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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Nov. 30, 2016
Dec. 31, 2014
May 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Unrecognized stock based compensation expense $ 4,862   $ 4,862        
2012 Equity Incentive Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Common stock shares authorized for issuance           880,000 440,000
2012 Equity Incentive Plan | Restricted Stock              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted stock shares issued     353,000 161,000      
Grant date fair value per share     $ 14.77        
Stock compensation expense recognized $ 618 $ 229 $ 1,378 $ 650      
2012 Equity Incentive Plan | Minimum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Expiration period     5 years        
Percent of voting power     10.00%        
2012 Equity Incentive Plan | Minimum | Restricted Stock              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Grant date fair value per share     $ 3.03        
Shares vest over period     1 year        
2012 Equity Incentive Plan | Maximum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Expiration period     10 years        
2012 Equity Incentive Plan | Maximum | Restricted Stock              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Grant date fair value per share     $ 19.00        
Shares vest over period     5 years        
2016 Omnibus Incentive Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Common stock shares authorized for issuance         3,911,000    
2016 Employee Stock Purchase Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Purchase interval period     6 months        
Percentage of purchase price to fair market value     85.00%        
Percentage of purchase limit on gross compensation 20.00%   20.00%