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Other Financial Statement Information - Schedule of Accrued Compensation (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Balance Sheet Related Disclosures [Abstract] |  |
Accrued compensation | $ 3,600 | $ 2,866
Accrued professional services | 480 | 1,074
Accrued property and equipment | 271 | 0
Accrued taxes | 374 | 0
Restricted stock liability, current | 267 | 484
Other | 982 | 723
Total accrued expenses | $ 5,974 | $ 5,147

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