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Stock-Based Compensation - Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Stock-based compensation disclosures
Compensation expense	$ 23,156	$ 27,243
Research and development
Stock-based compensation disclosures
Compensation expense	11,580	13,538
General and administrative
Stock-based compensation disclosures
Compensation expense	$ 11,576	$ 13,705

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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+ References

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