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Stock-Based Compensation and Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 10, 2020 | Jan. 28, 2020 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock options granted during period (in shares) |  |  |  |  |  | 239,275 |  |
Stock compensation expense (benefit) |  |  |  | $ 1,921 | $ 580 | $ 3,892 | $ (5,484) |
Stock issued under employee stock purchase plan (in shares) |  |  |  | 149,865 |  | 149,865 |  |
Warrants outstanding (in shares) |  |  |  | 9,400,000 |  | 9,400,000 |  | 10,500,000
Number of shares of common stock to be issued for upon exercise of warrants (in shares) |  |  |  | 5,200,000 |  | 5,200,000 |  | 5,800,000
Warrant, exercise price (in usd per share) |  |  |  | $ 24.39 |  | $ 24.39 |  | $ 24.39
Number of warrants exercised during period (in shares) |  |  |  | 1,011,224 | 0 | 1,011,424 | 0 |
Proceeds from warrant exercises |  |  |  | $ 13,700 |  | $ 13,700 |  |
Purchase of treasury stock (in shares) | 800,000 | 1,000,000.0 | 800,000 | 0 |  | 0 |  |
Purchase of treasury stock | $ 9,200 | $ 12,600 | $ 8,800 |  | $ 8,856 |  | $ 30,626 |
Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Weighted average exercise price of options exercised during period (in usd per share) |  |  |  |  |  | $ 3.68 |  |
Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Weighted average exercise price of options exercised during period (in usd per share) |  |  |  |  |  | $ 13.82 |  |
Stock Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock compensation expense (benefit) |  |  |  | $ 1,600 | $ 600 | $ 3,200 | $ (5,500) |
2021 Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock compensation expense (benefit) |  |  |  | $ 400 |  | $ 700 |  |
Purchase price, after discount |  |  |  |  |  | 85.00% |  |
Stock available for purchase under ESPP (in shares) |  |  |  | 2,000,000 |  | 2,000,000 |  |

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