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Other Financial Information - Change in the allowance for doubtful accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable, Unclassified [Abstract]    
Beginning balance $ 23 $ 11
Provisions (benefits) 235 12
Recoveries (write-offs), net (235) 0
Ending balance $ 23 $ 23