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Revenue, Contract Balances (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Revenue [Abstract]    
Revenue recognized $ 400  
Contract liabilities [Abstract]    
Unbilled receivables, current 329 $ 314
Unbilled receivables, non-current 253 308
Customer pre-payments (253) (99)
Deferred revenue, current (823) (805)
Deferred revenue, non-current (171) (186)
Total net contract (liabilities) assets $ (665) $ (468)