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Selected Balance Sheet Data (Tables)
12 Months Ended
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets for the years ended December 31, 2021 and 2020 consisted of the following (in thousands):
December 31, 2021December 31, 2020
Prepaid inventories$7,303 $
Prepaid insurance4,996 48 
Deposits (primarily deposits relating to equipment purchases)2,783 — 
Assets held for sale1,848 — 
Prepaid licenses and subscriptions801 — 
Other119 — 
Total
$17,850 $56 
Schedule of Other Current Liabilities
Other current liabilities for the years ended December 31, 2021 and 2020 consisted of the following (in thousands):
December 31, 2021December 31, 2020
Accrued expenses(1)
$3,997 $1,837 
Customer deposits
899 731 
Warranty liability
177 — 
Accrued interest
— 2,453 
Other
306 121 
Total
$5,379 $5,142 
____________
(1) Primarily relates to personnel costs — wages, health benefits, vacation and other accruals.