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Basis of Presentation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Unusual Risk or Uncertainty [Line Items] |  |  |  |  |  |  |  |  |
Cash, cash equivalents and marketable securities | $ 423,100 |  |  |  |  |  | $ 423,100 |  |
Net loss | (20,452) | $ (13,373) | $ (16,538) | $ (14,224) | $ (11,031) | $ (12,625) | (50,363) | $ (37,880) |
Net cash used in operations |  |  |  |  |  |  | (46,386) | (35,193) |
Indefinite-lived intangible assets | 27,200 |  |  |  |  |  | 27,200 |  | $ 30,700
Intangible asset impairment | $ 3,500 |  |  |  |  |  | 3,500 | $ 3,500 |
COVID-19 |  |  |  |  |  |  |  |  |
Unusual Risk or Uncertainty [Line Items] |  |  |  |  |  |  |  |  |
Intangible asset impairment |  |  |  |  |  |  | $ 27,200 |  |

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