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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