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Stockholders' Equity (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
May 12, 2021 USD ($) $ / shares shares | Nov. 06, 2020 USD ($) $ / shares shares | Sep. 18, 2020 shares | Jun. 30, 2020 shares | Dec. 24, 2019 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Sep. 17, 2020 shares
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  | 0.2 |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  | 67,231,903 |  |  | 98,039,540 | 82,575,064 | 336,159,511
Offering costs | $ |  |  |  |  |  | $ 118 | $ 48 |
Number of common stock shares into which each warrant converts (in shares) |  |  |  |  |  | 1 |  |
Warrants outstanding (in shares) |  |  |  |  |  | 5,821,137 | 5,821,137 |
Consulting Agreement | Affiliated entity |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Number of common stock shares into which warrants may be converted (in shares) |  |  |  |  | 3,358,732 |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  | $ 1.44 |  |  |
Warrants quarterly vesting period |  |  |  |  | 3 years |  |  |
Warrants |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate intrinsic value | $ |  |  |  |  |  | $ 6,559 | $ 18,260 |
Warrants | Consulting Agreement | Affiliated entity |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Warrants cancelled (in shares) |  |  |  | 2,798,945 |  |  |  |
Warrants outstanding (in shares) |  |  |  |  |  | 559,787 |  |
Rights Offering |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Consideration received on sale of stock | $ | $ 75,000 |  |  |  |  |  |  |
Shares issued (in shares) | 14,312,976 |  |  |  |  |  |  |
Sale of stock price (in dollars per share) | $ / shares | $ 5.24 |  |  |  |  |  |  |
Offering costs | $ | $ 159 |  |  |  |  |  |  |
Private placement |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Consideration received on sale of stock | $ |  | $ 50,000 |  |  | $ 50,000 |  |  |
Shares issued (in shares) |  | 14,970,060 |  |  | 35,075,690 |  |  |
Sale of stock price (in dollars per share) | $ / shares |  | $ 3.34 |  |  | $ 1.43 |  |  |
Offering costs | $ |  | $ 48 |  |  | $ 912 |  |  |
Number of common stock shares into which warrants may be converted (in shares) |  |  |  |  | 5,261,350 |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  | $ 1.58 |  |  |
Number of common stock shares into which each warrant converts (in shares) |  |  |  |  | 1 |  |  |
Minimum volume weighted average common stock price to warrant exercise price, premium, percentage |  |  |  |  | 50.00% |  |  |

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