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Stockholders' (Deficit) Equity - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 04, 2017
Mar. 08, 2017
Feb. 01, 2017
May 31, 2017
Sep. 30, 2016
May 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 30, 2016
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Capital stock shares authorized             105,000,000        
Preferred stock shares authorized             5,000,000        
Preferred stock, par value (in dollars per share)             $ 0.001 $ 0.001      
Common stock shares authorized             100,000,000        
Common stock, par value (in dollars per share)             $ 0.001 $ 0.001      
Options exercisable (in shares)             61,013        
Options outstanding, number of options (in shares)             61,013        
Employee Stock Option                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting period             1 year 7 months 1 day        
Options exercisable (in shares)             61,013 150,207 544,869    
Options outstanding, number of options (in shares)             61,013 187,707 1,394,869   1,030,521
Stock-based compensation expense             $ 15,000 $ 156,000 $ 99,000    
Tax benefit             $ 5,000 67,000 $ 38,000    
Share price (in dollars per share)             $ 5.55        
Options outstanding, intrinsic value             $ 209,000        
Vested and exercisable, weighted-average remaining contractual term             1 year 7 months 1 day        
Vested and exercisable, aggregate intrinsic value             $ 209,000        
Intrinsic value of options exercised             111,000        
Granted (in shares)                 850,000    
Grant date fair value                 $ 2,279,000    
Weighted average grant date fair value (in dollars per share)                 $ 1.10    
Expected Term (Years)                 3 years 11 months 25 days    
Unrecognized compensation cost related to stock options             0        
Restricted Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation expense             1,478,000 1,155,000 $ 842,000    
Tax benefit             452,000 496,000 321,000    
Grant date fair value $ 2,809,000 $ 104,000         2,913,000 $ 4,245,000 $ 2,166,000    
Unrecognized compensation cost related to stock options             $ 5,128,000        
Award of non-qualified options to purchase restricted stock, amount (in shares) 480,200 26,000         506,200 1,711,000 507,000    
Unrecognized compensation cost related to restricted stock, recognition period             2 years 4 months 21 days        
Common Stock Grants                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation expense             $ 368,000        
Granted (in shares)   52,000 56,940         206,750 67,609    
Grant date fair value               $ 246,000 $ 445,000    
Shares issued, price per share   $ 4.00 $ 2.81                
Minimum | Employee Stock Option                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting period             3 years        
Stock option term until expiration             5 years        
Minimum | Restricted Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting period             3 years        
Maximum | Employee Stock Option                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting period             4 years        
Stock option term until expiration             10 years        
Maximum | Restricted Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting period             4 years        
Accounting Standards Update 2016-09                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Adjustment to share-based compensation expense             $ 234,000        
2006 Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares authorized to be issued under the stock incentive plan       6,500,000   4,500,000       3,500,000  
Number of additional shares authorized to be issued under the stock incentive plan       2,000,000   1,000,000          
Number of shares available to be issued under the stock incentive plan             2,072,967        
2006 Plan | Employee Stock Option                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Options outstanding, number of options (in shares)             61,013        
Granted (in shares)             0 0 850,000    
Grant date fair value                 $ 2,279,000    
Non-Plan | Chief Operating Officer                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Non-cash severance expense         $ 250,000