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Private Placements and Public Offering (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 12, 2020 | Mar. 31, 2020 | Mar. 06, 2020 | Mar. 28, 2019 | Aug. 06, 2018 | Jan. 31, 2021 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jan. 25, 2021 | Dec. 31, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  |  |  | 1,516,073 |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  | $ 0.001 |  |  | $ 0.001
Proceeds from the exercise of warrants |  |  |  |  |  |  | $ 1,900 | $ 0 | $ 1,861 |  |
Exercise of warrants (shares) |  |  |  |  |  |  | 338,454 |  |  |  |
Proceeds from sale of stock |  |  |  |  |  | $ 29,400 |  |  |  |  |
Purchase price (in dollars per share) |  |  |  |  |  | $ 20.11 |  |  |  |  |
Preferred stock issued during the period |  |  |  |  |  |  |  | 0 | 25,000 |  |
Payments repurchase of preferred stock |  |  |  |  |  |  |  | $ 0 | $ 2,354 |  |
2018 Warrants |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  |  | 12,062,000 |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  | $ 0.001 |  |  |  |  |  |
Number of additional shares from warrants (in shares) |  |  |  |  | 4,221,700 |  |  |  |  |  |
Initial exercise price of warrants (in dollars per share) |  |  |  | $ 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 |  |  |  |  |  |  |
Initial exercise price of warrants (in dollars per share) |  |  |  | $ 7.00 |  |  |  |  |  |  |
Canaccord Genuity LLC |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Distribution Agreement, maximum aggregate amount authorized for offer or sale |  |  |  |  |  |  |  |  |  | $ 40,000 |
Series E preferred stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of shares (shares) |  |  | 25,000 |  |  |  |  |  |  |  |
Preferred stock issued during the period |  |  | $ 25,000 |  |  |  |  |  |  |  |
Stock repurchased (in shares) | 2,330 |  |  |  |  |  |  |  |  |  |
Payments repurchase of preferred stock | $ 2,400 |  |  |  |  |  |  |  |  |  |
Series E preferred stock | South Ocean Funding LLC |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of shares (shares) |  | 2,330 |  |  |  |  |  |  |  |  |

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