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Revenue, Contract Balances (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Revenue [Abstract]      
Revenue recognized $ 600    
Contract liabilities [Abstract]      
Unbilled receivables, current   $ 306 $ 290
Unbilled receivables, non-current   376 591
Customer pre-payments   (49) (216)
Deferred revenue, current   (768) (504)
Deferred revenue, non-current   (207) (111)
Total net contract (liabilities) assets   $ (342) $ 50