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Stockholders' Equity - At-the-Market equity offering - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Net proceeds |  | $ 105,615 | $ 306,779
ATM Offering |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issuance of common stock (in shares) | 577,956 |  |
Gross proceeds | $ 107,600 |  |
Net proceeds | 105,600 |  |
Commissions | 1,600 |  |
Stock issuance costs | $ 300 |  |
Maximum number of common stock to be sold | 3,000,000.0 |  |

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