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Warrants - (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 22, 2020 | Mar. 05, 2020 | Jan. 03, 2020 | Feb. 05, 2019 | Jan. 01, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Warrants |  |  |  |  |  |  |  |
Number of Shares Issuable |  |  |  |  |  | 52,704,735 |  |
Warrant liability reclassified to additional paid in capital |  |  |  |  | $ 3,448 |  |  |
Warrant, Down Round Feature, (Increase) Decrease in Equity, Amount |  |  |  |  |  | $ 303 | $ 359 |
Issuance of Series A & B Convertible Preferred Stock, net of underwriting discounts (in shares) |  |  |  | 7,557,142 |  |  |  |
Common stock issued |  |  |  | 7,557,142 |  |  |  |
Series A Convertible Preferred Stock |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Issuance of Series A & B Convertible Preferred Stock, net of underwriting discounts (in shares) |  |  |  |  |  | 1,421,801 |  |
Common stock issued |  |  |  |  |  | 1,421,801 |  |
Series B Convertible Preferred Stock |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Issuance of Series A & B Convertible Preferred Stock, net of underwriting discounts (in shares) |  |  |  |  |  | 1,137,442 |  |
Common stock issued |  |  |  |  |  | 1,137,442 |  |
2017 Warrants |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Exercise price of warrant |  |  |  | $ 6.085 |  | $ 1.055 |  | $ 1.75
Class of Warrant or Right, Exercised |  |  |  |  |  | $ 220 |  |
Number of warrants or rights exercised. |  |  |  |  |  | 208,254,000 |  |
2019 Warrants |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Number of Shares Issuable |  |  |  | 7,557,142 |  |  |  |
Exercise price of warrant |  |  |  | $ 1.95 |  |  |  |
Class of Warrant or Right, Exercised |  |  |  |  |  | $ 128 |  |
Number of warrants or rights exercised. |  |  |  |  |  | 65,700,000 |  |
January 2020 Warrants | Series A Convertible Preferred Stock |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Exercise price of warrant |  | $ 0.001 |  |  |  |  |  |
Issuance of Series A & B Convertible Preferred Stock, net of underwriting discounts (in shares) |  |  | 1,421,801 |  |  |  |  |
Purchase price |  |  | $ 10.54 |  |  |  |  |
Warrant to purchase shares of common stock |  | 14,413,902 |  |  |  |  |  |
Common stock issued |  |  | 1,421,801 |  |  |  |  |
January 2020 Warrants | Series B Convertible Preferred Stock |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Exercise price of warrant |  | $ 2.11 |  |  |  |  |  |
Issuance of Series A & B Convertible Preferred Stock, net of underwriting discounts (in shares) |  |  | 1,137,442 |  |  |  |  |
Purchase price |  |  | $ 10.55 |  |  |  |  |
Conversion of Stock, Shares Issued |  | 11,531,133 |  |  |  |  |  |
Common stock issued |  |  | 1,137,442 |  |  |  |  |
June 2020 Warrants |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Exercise price of warrant | $ 0.001 |  |  |  |  |  |  |
Warrant to purchase shares of common stock | 2,250,000 |  |  |  |  |  |  |
June 2020 Warrants | Common Stock |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Issuance of Series A & B Convertible Preferred Stock, net of underwriting discounts (in shares) | 20,250,000 |  |  |  |  |  |  |
Purchase price | $ 2.00 |  |  |  |  |  |  |
Common stock issued | 20,250,000 |  |  |  |  |  |  |
1/23/2017 |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Number of Shares Issuable |  |  |  |  |  | 54,516 |  |
Exercise price of warrant |  |  |  |  |  | $ 0.01 |  |
11/14/2017 |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Number of Shares Issuable |  |  |  |  |  | 2,549,840 |  |
Exercise price of warrant |  |  |  |  |  | $ 1.055 |  |
2/5/2019 |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Number of Shares Issuable |  |  |  |  |  | 7,491,442 |  |
Exercise price of warrant |  |  |  |  |  | $ 1.95 |  |
3/5/2020 |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Number of Shares Issuable |  |  |  |  |  | 14,413,902 |  |
Exercise price of warrant |  |  |  |  |  | $ 0.001 |  |
3/5/2020 |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Number of Shares Issuable |  |  |  |  |  | 25,945,035 |  |
Exercise price of warrant |  |  |  |  |  | $ 2.11 |  |
6/22/2020 |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Number of Shares Issuable |  |  |  |  |  | 2,250,000 |  |
Exercise price of warrant |  |  |  |  |  | $ 0.001 |  |
Common Stock | June 2020 Warrants |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Issuance of Series A & B Convertible Preferred Stock, net of underwriting discounts (in shares) | 20,250,000 |  |  |  |  |  |  |
Common stock issued | 20,250,000 |  |  |  |  |  |  |

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