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Composition of Certain Consolidated Financial Statement Items - Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accrued purchases $ 106 $ 2,006
Professional services 1,558 1,739
Sales tax 1,725 829
Interest 333 532
Travel expenses 519 429
Asset retirement obligation 232 200
Clinical trial expenses 392 175
Other 1,453 1,558
Total other current liabilities $ 6,318 $ 7,468