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Long-Term Debt (Details Textual) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 18, 2020 USD ($) | Dec. 17, 2019 USD ($) d $ / shares shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Sep. 13, 2020 $ / shares
Senior Convertible Notes and Warrants |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.001 | $ 0.001 |
Net proceeds from issuance of senior convertible notes |  |  |  | $ 2,654,000 |
Proceeds of the Loan |  |  | 1,499,000 |  |
Common Stock |  |  |  |  |
Senior Convertible Notes and Warrants |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.001
Warrants, Initial exercise price per share | $ / shares |  |  |  |  | $ 2.43
Common Stock | Beneficial owner |  |  |  |  |
Senior Convertible Notes and Warrants |  |  |  |  |
Beneficial owner of the Company’s issued and outstanding shares of Common Stock |  | 46.60% |  |  |
Senior Convertible Notes and Warrants |  |  |  |  |
Senior Convertible Notes and Warrants |  |  |  |  |
Issuance and sale of secured convertible notes |  | $ 3,000 |  |  |
Original issue discount and issuance costs |  | 346,000 |  |  |
Net proceeds from issuance of senior convertible notes |  | $ 2,654,000 |  |  |
Amortization of debt issuance costs and discounts |  |  | $ 197,000 |  |
Senior Convertible Notes and Warrants | Common Stock |  |  |  |  |
Senior Convertible Notes and Warrants |  |  |  |  |
Warrants to purchase of common stock, shares | shares |  | 340,909 |  |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.001 |  |  |
Senior Convertible Notes |  |  |  |  |
Senior Convertible Notes and Warrants |  |  |  |  |
Interest accrual at a variable rate adjusted on a quarterly basis, percent |  | 2.50% |  |  |
Published in the Wall Street Journal (New York edition) as of the beginning of such calendar quarter |  | Prime Rate |  |  |
Senior Convertible Notes | Greater of |  |  |  |  |
Senior Convertible Notes and Warrants |  |  |  |  |
Interest accrual at a variable rate adjusted on a quarterly basis, percent |  | 5.25% |  |  |
Senior Convertible Notes | Common Stock |  |  |  |  |
Senior Convertible Notes and Warrants |  |  |  |  |
Senior Convertible Notes, Initial conversion price per share | $ / shares |  | $ 2.11 |  |  |
Senior Convertible Notes, Threshold percentage of stock price trigger |  | 120.00% |  |  |
Senior Convertible Notes, Threshold consecutive trading days | d |  | 90 |  |  |
Senior Convertible Notes | Common Stock | Greater of |  |  |  |  |
Senior Convertible Notes and Warrants |  |  |  |  |
Senior Convertible Notes, Threshold percentage of stock price trigger |  | 200.00% |  |  |
Warrants | Common Stock |  |  |  |  |
Senior Convertible Notes and Warrants |  |  |  |  |
Warrants, Initial exercise price per share | $ / shares |  | $ 1.76 |  |  |
Paycheck Protection Program Loan |  |  |  |  |
Senior Convertible Notes and Warrants |  |  |  |  |
Proceeds of the Loan | $ 1,499,000 |  |  |  |
Loan term | 2 years |  |  |  |
Interest rate of the loan | 1.00% |  |  |  |

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