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Composition of Certain Consolidated Financial Statement Items - Other Current Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Accrued purchases | $ 1,105 | $ 432
Customer deposit | 741 | 0
Professional services | 600 | 339
Sales tax | 515 | 302
Interest | 405 | 403
Travel expenses | 281 | 138
Clinical trial expenses | 183 | 47
Other | 778 | 316
Other current liabilities | $ 4,608 | $ 1,977

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