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Share-based Payments (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 13, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 12, 2016
Share-Based Payments          
Number of options, outstanding   843,446 544,647 624,256  
Share based compensation recognized   $ 58 $ 208    
Tax benefit from compensation cost   0 $ 0    
Total compensation cost related to stock options not yet recognized   $ 457      
Compensation cost related to stock options expected to be recognized (in years)   3 years 8 months 19 days      
Common stock, par value (in dollars per share)   $ 0.001 $ 0.001    
Proceeds from issuance of common stock, net of issuance costs   $ 4,764    
Common Stock          
Share-Based Payments          
Number fo shares were agreed to issue and sell in a registered direct offering 2,116,050        
Common stock, par value (in dollars per share) $ 0.001        
Offering price (Per share) $ 2.4925        
Proceeds from issuance of common stock, gross $ 5,275        
Proceeds from issuance of common stock, net of issuance costs $ 4,764        
Common stock shares issued 1,058,025        
Exercise price of warrants $ 2.43        
Expiry term of warrants 5 years        
Directors and officers          
Share-Based Payments          
Options vesting period (years)   3 years      
Other employees          
Share-Based Payments          
Options vesting period (years)   4 years      
2007 Equity Incentive Plan          
Share-Based Payments          
Number of shares authorized         2,000,000
Number of options, outstanding   843,446      
Number of authorized unissued options   621,408      
2007 Equity Incentive Plan | Minimum          
Share-Based Payments          
Options vesting period (years)   3 years      
2007 Equity Incentive Plan | Maximum          
Share-Based Payments          
Options vesting period (years)   4 years      
Employee Stock Purchase Plan          
Share-Based Payments          
Number of shares authorized   500,000      
Number of shares available for grant   413,868 422,866    
Percentage of voting rights   5.00%      
Shares purchased under ESPP plan   8,998 20,128    
Purchase price of common stock, percentage   85.00%      
Discount on purchase price of common stock, percentage   15.00%      
Employee Stock Purchase Plan | Maximum          
Share-Based Payments          
Shares purchased under ESPP plan   2,500      
Proceeds from employee stock purchase plan   $ 25