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Significant Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Supplemental Balance Sheet Information [Abstract]
Contract assets	$ 5,359	$ 7,079
Deferred contract costs	4,564	4,855
Prepaid insurance	6,521	345
Prepaid other	7,743	3,780
Preferred stock warrant exercise receivable	0	2,158
Recording fee advances	4,243	0
Other current assets	3,283	1,051
Total prepaid expenses and other current assets	$ 31,713	$ 19,268

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