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Stockholders'/Members' Equity (Deficit)Stockholders' Equity - Schedule of Stock-based Compensation Expense (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Class Of Stock [Line Items] |  |
Stock-based compensation | $ 4,643,000 | $ 0
Research and Development Expense |  |
Class Of Stock [Line Items] |  |
Stock-based compensation | 954,000 |
General and Administrative Expense |  |
Class Of Stock [Line Items] |  |
Stock-based compensation | $ 3,689,000 |

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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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