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Liabilities - Customer Deposits and Deferred Revenue (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Liabilities    
Customer deposits and deferred revenue $ 54,300 $ 26,600
Changes in deferred revenue    
Beginning balance 28,249  
Deferral of revenue 7,391  
Recognition of previously deferred revenue (18,370)  
Ending balance $ 17,270