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Revenue from Contract with Customers - Contract Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]      
Contract liability with customer $ 3,600   $ 4,600
Deferred revenue recognized in earnings 2,328 $ 7,735  
Deferred revenue $ 1,397 $ 5,783