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Stockholders' Equity - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Apr. 24, 2019
Dec. 31, 2018
Aug. 31, 2018
May 16, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock authorized (shares) 75,000,000          
Common stock par value (usd per share) $ 0.0001          
Preferred stock authorized (shares) 25,000,000          
Preferred stock par value (usd per share) $ 0.0001          
Options outstanding (shares) 0     0    
Common stock outstanding (shares) 19,204,056     19,389,066    
Preferred stock outstanding (shares) 0     0    
Stock repurchase authority         $ 10,000,000  
Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Dividend rate (usd per share)     $ 0.125      
Dividends declared     $ 2,400,000      
2012 Equity Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (shares)           2,194,986
2012 Equity Plan | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period 1 year          
2012 Equity Plan | Restricted Stock and Restricted Stock Units with Contingent Performance Requirements            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period 3 years          
2012 Equity Plan | Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period 3 years          
Performance-based RSUs | Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Equity instruments other than options, nonvested (shares) 622,750     404,325    
2011 Long Term Incentive Plan | Restricted Stock and Restricted Stock Units with Contingent Performance Requirements            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Equity instruments other than options, nonvested (shares) 363,169          
2011 Long Term Incentive Plan | Restricted Stock and Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation cost not yet recognized, share-based awards other than options $ 5,900,000          
Weighted-average period over which cost is expected to be recognized 2 years 12 days          
ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (shares) 250,000          
Award required holding period 2 years          
Stock purchased during period (shares) 0 0        
Maximum | ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Offering period, maximum 6 months