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Stockholders' Equity (Narrative) (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 18, 2021 shares | Jan. 31, 2021 shares | Jun. 30, 2021 USD ($) shares | Jun. 30, 2021 USD ($) shares | Jun. 30, 2020 USD ($) shares | Dec. 02, 2020 shares | Aug. 04, 2020 shares | Mar. 31, 2020 item
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |
Number of equity compensation plans | item |  |  |  |  |  |  |  | 3
Stock-based compensation | $ |  |  |  | $ 25,970 | $ 7,266 |  |  |
ESPP [Member] |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |
Shares issued |  |  |  | 983,180 | 0 |  |  |
Additional common stock reserved for issuance |  | 3,800,000 |  |  |  |  |  |
Common stock remain available for issuance |  |  | 8,741,461 | 8,741,461 |  |  |  |
Stock-based compensation | $ |  |  | $ 5,500 | $ 8,000 |  |  |  |
2020 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |
Shares authorized |  |  |  |  |  |  | 11,000,000 |
Common stock remain available for issuance |  |  | 5,800,000 | 5,800,000 |  |  |  |
2020 Inducement Equity Incentive Plan [Member] |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |
Shares authorized |  |  |  |  |  | 2,500,000 |  |
Additional common stock reserved for issuance | 750,000 |  |  |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation | $ |  |  | $ 3,400 | $ 5,900 |  |  |  |
Time-Based Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation | $ |  |  | 6,800 | 11,900 |  |  |  |
Performance-Based Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation | $ |  |  | $ 0 | $ 0 |  |  |  |

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