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Composition of Certain Consolidated Financial Statement Items - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Insurance $ 2,333 $ 124
Inventory 830 553
Software 428 375
Rent 253 245
Other 398 356
Total prepaid expenses and other current assets $ 4,242 $ 1,653