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Selected Balance Sheet Data - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Prepaid inventories $ 7,303 $ 8
Prepaid insurance 4,996 48
Deposits (primarily deposits relating to equipment purchases) 2,783 0
Assets held for sale 1,848 0
Prepaid licenses and subscriptions 801 0
Other 119 0
Total $ 17,850 $ 56