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Stockholder's Equity (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options exercised (in shares) 7    
Stock options granted (in shares) 0    
Stock options expired (in shares) 2    
Stock options outstanding (in shares) 1,267    
Stock options outstanding, weighted average exercise price (in USD per share) $ 10.29    
Stock options exercisable (in shares) 514    
Exercisable stock options, weighted average exercise price (in US per share) $ 10.37    
Restricted stock surrendered (in shares) 0    
Allocated share-based compensation expense $ 874,000 $ 853,000  
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense $ 2,152,000    
Weighted-average period of recognition (in years) 2 years 8 months 6 days    
Allocated share-based compensation expense $ 860,000 $ 843,000  
Restricted stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense $ 3,743,000    
Weighted-average period of recognition (in years) 1 year 11 months 5 days    
Restricted stock options (in shares) 78    
Restricted stock options, weighted average price (in USD per share) $ 10.59    
Restricted stock award, forfeitures $ 0    
Restricted stock vested (in shares) 194    
Restricted stock outstanding, nonvested (in shares) 409    
ESPP Plan | Employee Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock options (in shares) 23 0  
Percentage of Company's common stock share price     85.00%
Allocated share-based compensation expense $ 14,000 $ 10,000