Stockholders'/Members' Equity (Deficit)Stockholders' Equity - Schedule of Stock-based Compensation Expense (Details) - USD ($)	3 Months Ended
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

Amount of noncash expense for share-based payment arrangement.

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

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration