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Stock-Based Compensation - Narrative (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2016
Dec. 31, 2015
May 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of options vested (in shares) 261,000   177,000 90,000      
Fair value of options vested   $ 844 $ 1,047 $ 731      
Unrecognized stock based compensation expense $ 7,598 $ 7,598          
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock shares issued (in shares)   1,884,000 746,000        
Grant date fair value per share (in dollars per share)   $ 2.58 $ 6.61        
2012 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock shares authorized for issuance (in shares)           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 (in shares)   1,884,000 746,000 352,000      
Stock compensation expense recognized   $ 2,909 $ 2,938 $ 1,973      
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%          
Shares vest over period   1 year          
2012 Equity Incentive Plan | Minimum | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Grant date fair value per share (in dollars per share)   $ 2.44          
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 (in dollars 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 (in shares)         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%