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Stock-based Compensation - 2015 Option Amendments (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jul. 21, 2015
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2016
Jul. 23, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Outstanding stock options (in shares)     1,379,727 1,819,444   615,322
Exercise price (in dollars per share)     $ 8.71 $ 7.52   $ 9.55
Number of shares exercisable (in shares)     635,548 1,022,515    
Weighted average exercise price (in dollars per share)     $ 9.41 $ 8.59    
2014 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted-average incremental fair value (in dollars per share)     $ 3.77      
Expected incremental compensation cost     $ 1,869      
2014 Equity Incentive Plan | Chief Financial Officer            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Post employment options exercise period   90 days        
Post employment extended options exercise period   36 months        
Outstanding stock options (in shares)   74,490        
Exercise price (in dollars per share)   $ 9.53        
Number of unvested shares (in shares)   50,814        
Weighted average exercise price (in dollars per share)   $ 9.49        
Compensatory Arrangement with Executive Officer | President            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Post employment options exercise period 90 days          
Post employment extended options exercise period 48 months          
Number of unvested shares (in shares)         183,268  
Number of shares exercisable (in shares)         84,613  
Weighted average exercise price (in dollars per share)         $ 9.61  
Nonvested options weighted average grant date fair value (in dollars per share)         $ 9.41