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Significant Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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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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