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v3.19.3.a.u2

Subsequent Events - Additional Information (Details) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 24, 2019 $ / shares | Oct. 22, 2019 $ / shares | Sep. 17, 2019 $ / shares | Mar. 29, 2019 USD ($) | Mar. 29, 2019 USD ($) | May 02, 2018 | Nov. 06, 2017 | Nov. 14, 2019 shares | May 23, 2019 USD ($) | Dec. 31, 2017 $ / shares shares | Sep. 30, 2019 $ / shares | Jun. 06, 2019 USD ($) shares | Jan. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,500,000
Common stock par value per share | $ / shares |  |  | $ 0.01 |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  | $ 0.01
Pre-Funded Series D Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares issuable on cancellation of warrants | shares |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |
Series D Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares issuable on cancellation of warrants | shares |  |  |  |  |  |  |  |  |  |  |  | 5,605 |  |
Series D Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, stated value |  |  |  | $ 1,160,000 | $ 1,160,000 |  |  |  |  |  |  |  |  |
Issuance of senior secured promissory note in exchange of preferred stock |  |  |  | $ 1,560,000 | $ 1,560,000 |  |  |  |  |  |  |  |  |
Interest rate on promissory note |  |  |  | 8.00% | 8.00% |  |  |  |  |  |  |  |  |
Maturity date |  |  |  | Apr. 01, 2020 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock subscription price per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,225 |
Interest rate on promissory note |  |  |  |  |  |  |  |  | 8.00% |  |  | 8.00% |  |
Aggregate borrowed amount |  |  |  |  |  |  |  |  | $ 3,300,000 |  |  |  |  |
Debt instrument, principal face amount |  |  |  |  |  |  |  |  | $ 3,300,000 |  |  | $ 2,000,000 |  |
Maturity period |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |
Common stock par value per share | $ / shares |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Pre-Funded Series D Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares issuable on cancellation of warrants | shares |  |  |  |  |  |  |  |  |  |  |  |  | 11,285 |
Number of warrants available for cancellation | shares |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |
Subsequent Event [Member] | Series D Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants available for cancellation | shares |  |  |  |  |  |  |  |  |  |  |  | 5,605 |  |
Subsequent Event [Member] | Series D Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, stated value |  |  |  | $ 1,160,000 | $ 1,160,000 |  |  |  |  |  |  |  |  |
Proceeds from exchanage of preferred stock |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |
Issuance of senior secured promissory note in exchange of preferred stock |  |  |  | $ 1,560,000 | $ 1,560,000 |  |  |  |  |  |  |  |  |
Interest rate on promissory note |  |  |  | 8.00% | 8.00% |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Apr. 01, 2020 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock subscription price |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  | 0.01 |  |  | 0.002 | 0.0029 |  |  |  |  |  |  |
Issuance of common stock and rights for payments made in shares on convertible notes payable (in shares) | shares |  |  |  |  |  |  |  |  |  | 375 |  |  |  |
Common Stock [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  | 0.0008 |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  | 0.02 |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock par value per share | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio | 0.0014 | 0.01 |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | Subsequent Event [Member] | Series E and E1 Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock and rights for payments made in shares on convertible notes payable (in shares) | shares |  |  |  |  |  |  |  | 3,700,000 |  |  |  |  |  |

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