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Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 06, 2020 | Aug. 09, 2019 | Mar. 28, 2019 | Aug. 06, 2018 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 22, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of additional shares from warrants (in shares) |  |  |  |  | 1,255,129 |  | 1,255,129 |
Proceeds from the exercise of warrants |  |  |  |  | $ 6,900 | $ 1,861 | $ 17,542 |
Preferred stock, shares authorized |  |  |  |  | 2,000,000 | 2,000,000 | 2,000,000 |
Preferred stock, par value (in dollars per share) |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |
Number of rights issued per common stock (in shares) |  |  |  |  |  |  |  | 1
Preferred stock issued during the period |  |  |  |  |  | $ 25,000 | $ 10,000 |
Dividends accrued |  |  |  |  | $ 400 | $ 2,900 | $ 400 |
2018 Warrants |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  | 12,062,000 |  |  |  |
Number of additional shares from warrants (in shares) |  |  |  | 4,221,700 |  |  |  |
Proceeds from sale of stock |  |  |  | $ 19,700 |  |  |  |
Exercise price per share (in dollars per share) |  |  | $ 2.52 | $ 2.52 |  |  |  |
Proceeds from the exercise of warrants |  |  | $ 10,600 |  |  |  |  |
2019 Warrants |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of additional shares from warrants (in shares) |  |  | 2,500,000 |  |  |  |  |
Exercise price per share (in dollars per share) |  |  | $ 7.00 |  |  |  |  |
Series D Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Exercise price per share (in dollars per share) |  |  |  |  |  |  |  | $ 10.00
Preferred stock, shares authorized |  |  |  |  |  | 150,000 |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  | $ 0.001
Number of preferred shares issued from exercise of right (in shares) |  |  |  |  |  |  |  | 0.001
Series E preferred shares |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 25,000 |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  | 10,000 | 39,500 | 10,000 |
Preferred stock, par value (in dollars per share) | $ 0.001 |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |
Purchase price (in dollars per share) | $ 1,000 |  |  |  |  |  |  |
Preferred stock issued during the period | $ 25,000 | $ 10,000 |  |  |  |  |  |
Dividend rate |  | 9.00% |  |  |  |  |  |
Redemption price |  | 110.00% |  |  |  |  |  |
Liquidation preference per share (in dollars per share) |  | $ 1,000 |  |  | $ 1,000 | $ 1,000 | $ 1,000 |
Number of shares sold | 25,000 | 10,000 |  |  |  |  |  |

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