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Revenue - Schedule of Significant Changes in Contract Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Contract with Customer, Liability [Roll Forward]    
Beginning balance $ 225 $ 0
Revenue recognized that was included in the contract liabilities beginning balance (225) 0
Increase due to cash received and not recognized as revenue and billings in excess of revenue recognized during the period 2,284 225
Ending balance $ 2,284 $ 225