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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Stock-based compensation expense
Total stock-based compensation expense	$ 4,157	$ 582	$ 11,286	$ 736
Research and development
Stock-based compensation expense
Total stock-based compensation expense	2,405	392	6,427	495
General and administrative
Stock-based compensation expense
Total stock-based compensation expense	$ 1,752	$ 190	$ 4,859	$ 241

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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