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Stock-Based Compensation - Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Compensation expense:
Total stock-based compensation expense	$ 38,048	$ 53,123	$ 70,981	$ 106,183
Research and development
Compensation expense:
Total stock-based compensation expense	19,695	24,779	36,582	48,569
General and administrative
Compensation expense:
Total stock-based compensation expense	$ 18,353	$ 28,344	$ 34,399	$ 57,614

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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+ References

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