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Stockholders' Equity (Narrative) (Details) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 04, 2018 USD ($) $ / shares shares | Jul. 21, 2017 USD ($) $ / shares shares | Jul. 31, 2017 $ / shares shares | Dec. 31, 2019 USD ($) item $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  | $ 0.001 | $ 0.001 |
Common stock, par value (in dollars per share) |  |  |  | $ 0.001 | $ 0.001 |
Proceeds from issuance of common stock, net of issuance costs | $ |  |  |  | $ 4,049,000 | $ 630,000 |
Proceeds from further issuance of share | $ |  |  |  | $ 4,049,000 | $ 630,000 |
Percentage of blocker provision |  |  |  | 4.99% |  |
Conversion percentage |  |  |  | 9.99% |  |
Number of warrant outstanding | $ |  |  |  | $ 7,490,500 |  |
Warrant exercise price |  |  |  | $ 2.00 |  |
Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Proceeds from further issuance of share | $ |  |  |  | $ 5,000 |  |
Number of shares issued (in shares) | shares |  |  |  | 4,702,527 | 500,000 |
Underwriting Agreement [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Proceeds from issuance of common stock, net of issuance costs | $ |  | $ 13,700,000 |  |  |  |
Common Stock Sales Agreement [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.001 |  |  |  |  |
Proceeds from issuance of common stock, net of issuance costs | $ | $ 4,700,000 |  |  |  |  |
Number of shares issued (in shares) | shares | 5,202,527 |  |  |  |  |
Selling commissions, percentage | 3.00% |  |  |  |  |
Class B Units [Member] | Underwriting Agreement [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of shares issued (in shares) | shares |  | 8,872 |  |  |  |
Share Price |  | $ 1,000 |  |  |  |
Class B Units [Member] | Underwriting Agreement [Member] | Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of common shares issued upon conversion | shares |  | 500 |  |  |  |
Price per share used to determine number of shares of common stock |  | $ 1,000.00 |  |  |  |
Class A Units [Member] | Underwriting Agreement [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of shares issued (in shares) | shares |  | 3,154,000 |  |  |  |
Share issue price per share |  | $ 2 |  |  |  |
Class A Units [Member] | Underwriting Agreement [Member] | Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of warrants connected with Underwritten Public Offering | shares |  | 1 |  |  |  |
Number of securities called by each unit | shares |  | 1 |  |  |  |
Maximum [Member] | Common Stock Sales Agreement [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Proceeds from further issuance of share | $ | $ 5,000,000 |  |  |  |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, shares issued | shares |  |  | 8,872 | 264 | 264 |
Preferred stock, shares outstanding | shares |  |  |  | 264 | 264 |
Preferred stock, par value (in dollars per share) |  |  |  | $ 0.001 | $ 0.001 |
Number of common shares issued upon conversion | shares |  |  |  |  | 4,304,000 |
Number of shares converted | shares |  |  |  | 132,000 | 8,608 |
Price per share used to determine number of shares of common stock |  |  | $ 1,000 |  |  |
Conversion price of convertible preferred stock |  |  | $ 2.00 |  |  |
Percentage of blocker provision |  |  | 4.99% |  |  |
Conversion percentage |  |  | 9.99% |  |  |
Measurement period of consecutive trading days used in determining whether specified triggers are met which would allow the entity to require the conversion of all or part of outstanding preferred stock |  |  |  | 30 days |  |
Series A Convertible Preferred Stock [Member] | Underwriting Agreement [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.001 |  |  |  |
Series A Convertible Preferred Stock [Member] | Class B Units [Member] | Underwriting Agreement [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of securities called by each unit | shares |  | 1 |  |  |  |
Series A Convertible Preferred Stock [Member] | Minimum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Percentage by which the weighted average price of common stock during the measurement period exceeds the initial conversion price which triggers the right of the entity to cause all or part of the outstanding preferred stock to be converted |  |  |  | 300.00% |  |
Threshold amount of daily trading volume on each trading day during the measurement period which triggers the right of the entity to cause all or part of the outstanding preferred stock to be converted | $ |  |  |  | $ 500,000 |  |
6% Convertible Exchangeable Preferred Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, shares issued | shares |  |  |  | 335,273 | 335,273 |
Preferred stock, shares outstanding | shares |  |  |  | 335,273 | 335,273 |
Number of common shares issued upon conversion | shares |  |  |  | 0.00507 |  |
Dividend rate on convertible exchangeable preferred stock (in percent) |  |  |  | 6.00% | 6.00% |
Share issue price per share |  |  |  | $ 10.00 |  |
Liquidation preference (in dollars per share) |  |  |  | 10.00 |  |
Accrued and unpaid dividends in arrears on preferred stock | $ |  |  |  |  | $ 700,000 | $ 700,000
Accrued and unpaid dividends in arrears on preferred stock (in dollars per share) |  |  |  |  | $ 1.95 | $ 1.95
Shares reserved for future issuance upon conversion | shares |  |  |  |  | 1,698 |
Conversion price (in dollars per share) |  |  |  | 1,974 |  |
Share Price |  |  |  | $ 2,961 |  |
Percentage of closing sales price of common stock that conversion price must exceed in order for preferred stock to be convertible |  |  |  | 150.00% |  |
Number of trading days within 30 trading days in which the closing price of common stock must exceed conversion price for preferred stock to be convertible |  |  |  | 20 days |  |
Number of trading days during which closing price of common stock must exceed conversion price for at least 20 days in order for the preferred stock to be convertible |  |  |  | 30 days |  |
Number of trading days prior to notice of automatic conversion |  |  |  | 5 days |  |
Number of quarterly periods in which dividends are not paid that triggers the right of preferred stock holders to nominate and elect directors | item |  |  |  | 6 |  |
Redemption price per share (in dollars per share) |  |  |  | $ 10.00 |  |
Interest rate of Convertible Subordinated Debentures (as a percent) |  |  |  | 6.00% |  |
Debt principal amount per share, basis for exchange (in dollars per share) |  |  |  | $ 10.00 |  |
Debt instrument, term |  |  |  | 25 years |  |
Preferred stock dividend declared, amount per share |  |  |  | $ 0.15 |  |

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