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Selected Balance Sheet Data - Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accrued expenses $ 3,997 $ 1,837
Customer deposits 899 731
Warranty liability 177 0
Accrued interest 0 2,453
Other 306 121
Other current liabilities $ 5,379 $ 5,142