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Composition of Certain Consolidated Financial Statement Items - Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
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