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Balance Sheets Components - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Deferred offering costs	$ 0	$ 3,220
Prepaid expenses	5,617	2,848
Other receivables	2,786	873
Other	64	138
Prepaid expenses and other current assets	$ 8,467	$ 7,079

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Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period.

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