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Warrants (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 22, 2020 $ / shares shares | Mar. 05, 2020 $ / shares shares | Jan. 03, 2020 Vote item $ / shares shares | Feb. 05, 2019 $ / shares shares | Jan. 01, 2019 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Warrants |  |  |  |  |  |  |
Number of Shares Issuable |  |  |  |  |  | 52,704,735 |
Warrant, equity component | $ |  |  |  |  | $ 3,448 |  | $ 3,448
Dividend attributable to down round feature of warrants | $ |  |  |  |  |  | $ 303 | $ 359
Common stock issued |  |  |  | 7,557,142 |  |  |
Common Stock |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  | 7,557,142
Series A Convertible Preferred Stock |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  | 1,421,801 |
Series B Convertible Preferred Stock |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  | 1,137,442 |
2017 Warrants |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |
Exercise price of warrant | $ / shares |  |  |  |  | $ 6.085 | $ 1.055 | $ 1.75
Warrant, equity component | $ |  |  |  |  | $ 3,448 |  |
Dividend attributable to down round feature of warrants | $ |  |  |  |  |  | $ 303 | $ 359
Number of warrants or rights exercised |  |  |  |  |  | 208,254 |
Class of Warrant or Right, Exercised | $ |  |  |  |  |  | $ 220 |
2019 Warrants |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |
Exercise price of warrant | $ / shares |  |  |  | $ 1.95 |  |  |
Warrant to purchase shares of common stock |  |  |  | 7,557,142 |  |  |
Number of warrants or rights exercised |  |  |  |  |  | 65,700 |
Class of Warrant or Right, Exercised | $ |  |  |  |  |  | $ 128 |
January 2020 Warrants | Series A Convertible Preferred Stock |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |
Exercise price of warrant | $ / shares |  | $ 0.001 |  |  |  |  |
Warrant to purchase shares of common stock |  | 14,413,902 |  |  |  |  |
Common stock issued |  |  | 1,421,801 |  |  |  |
Purchase price | $ / shares |  |  | $ 10.54 |  |  |  |
Number of special voting stock | Vote |  |  | 1 |  |  |  |
Number of members to elect of board of directors | item |  |  | 1 |  |  |  |
January 2020 Warrants | Series B Convertible Preferred Stock |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |
Exercise price of warrant | $ / shares |  | $ 2.11 |  |  |  |  |
Common stock issued |  |  | 1,137,442 |  |  |  |
Purchase price | $ / shares |  |  | $ 10.55 |  |  |  |
Conversion of Stock, Shares Issued |  | 11,531,133 |  |  |  |  |
June 2020 Warrants |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |
Exercise price of warrant | $ / shares | $ 0.001 |  |  |  |  |  |
Warrant to purchase shares of common stock | 2,250,000 |  |  |  |  |  |
June 2020 Warrants | Common Stock |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |
Common stock issued | 20,250,000 |  |  |  |  |  |
Purchase price | $ / shares | $ 2.00 |  |  |  |  |  |
1/23/2017 |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |
Number of Shares Issuable |  |  |  |  |  | 54,516 |
Exercise price of warrant | $ / shares |  |  |  |  |  | $ 0.01 |
11/14/2017 |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |
Number of Shares Issuable |  |  |  |  |  | 2,549,840 |
Exercise price of warrant | $ / shares |  |  |  |  |  | $ 1.055 |
2/5/2019 |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |
Number of Shares Issuable |  |  |  |  |  | 7,491,442 |
Exercise price of warrant | $ / shares |  |  |  |  |  | $ 1.95 |
3/5/2020 |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |
Number of Shares Issuable |  |  |  |  |  | 14,413,902 |
Exercise price of warrant | $ / shares |  |  |  |  |  | $ 0.001 |
3/5/2020 |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |
Number of Shares Issuable |  |  |  |  |  | 25,945,035 |
Exercise price of warrant | $ / shares |  |  |  |  |  | $ 2.11 |
6/22/2020 |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |
Number of Shares Issuable |  |  |  |  |  | 2,250,000 |
Exercise price of warrant | $ / shares |  |  |  |  |  | $ 0.001 |

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