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Supplemental Financial Statement Information- Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020		Sep. 30, 2020	Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]
Cash	$ 37,765	$ 39,552
Cash equivalents	119,765	4,207
Cash and cash equivalents	157,530	43,759	[1]
Restricted cash	3,354	3,354	[1]
Total cash, cash equivalents and restricted cash	$ 160,884	$ 47,113		$ 91,187	$ 26,820
[1] See Note 1 – Summary of Business and Significant Accounting Policies

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