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Selected Balance Sheet Data
12 Months Ended
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Selected Balance Sheet Data Selected Balance Sheet Data
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 

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 
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(1) Primarily relates to personnel costs — wages, health benefits, vacation and other accruals.