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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 |  |  |

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