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Revenue, Contract Balances (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Revenue [Abstract]    
Revenue recognized $ 400  
Contract liabilities [Abstract]    
Unbilled receivables, current 293 $ 290
Unbilled receivables, non-current 516 591
Customer pre-payments (146) (216)
Deferred revenue, current (569) (504)
Deferred revenue, non-current (202) (111)
Contract with Customer, Asset (Liability), net $ (108) $ 50