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Stockholders' Equity - Schedule of Warrants Outstanding (Details) shares in Thousands | Dec. 31, 2020 $ / shares shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2019 shares
--- | --- | --- | ---
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares | 375 | 375 | 75
Exercise Price | (per share) | $ 0.12 | $ 0.15 |
Warrants |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares | 375 | 375 |
Common Stock Warrant One |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares | 33 | 33 |
Exercise Price | $ / shares | $ 47.00 |  |
Expiration | Jan. 31, 2023 | Jan. 31, 2023 |
Common Stock Warrant Two |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares | 101 | 101 |
Exercise Price | $ / shares | $ 2.40 |  |
Expiration | Oct. 31, 2023 | Oct. 31, 2023 |
2014 | Warrants |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares | 27 | 27 |
Exercise Price | $ / shares |  | $ 1.00 |
Expiration | Dec. 31, 2025 | Dec. 31, 2025 |
2015 | Warrants |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares | 4 | 4 |
Exercise Price | $ / shares |  | $ 1.00 |
Expiration | Aug. 31, 2022 | Aug. 31, 2022 |
2016 | Warrants |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares | 19 | 19 |
Exercise Price | $ / shares |  | $ 1.479 |
Expiration | Dec. 31, 2025 | Dec. 31, 2025 |
2017 | Warrants |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares | 7 | 7 |
Exercise Price | $ / shares |  | $ 1.479 |
Expiration | Dec. 31, 2022 | Dec. 31, 2022 |
2017 | Warrants |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares | 15 | 15 |
Exercise Price | $ / shares |  | $ 1.479 |
Expiration | Dec. 31, 2025 | Dec. 31, 2025 |
2019 | Warrants |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares | 3 | 3 |
Exercise Price | $ / shares |  | $ 1.479 |
Expiration | Dec. 31, 2025 | Dec. 31, 2025 |
2020 | Warrants |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares | 98 | 98 |
Exercise Price | $ / shares |  | $ 0.15 |
Expiration | Dec. 31, 2025 | Dec. 31, 2025 |
2021 | Warrants |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares | 202 | 202 |
Exercise Price | $ / shares |  | $ 0.15 |
Expiration | Dec. 31, 2023 | Dec. 31, 2023 |

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