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Liabilities - Customer Deposits and Deferred Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Liabilities    
Customer deposits and deferred revenue $ 52,200 $ 49,300
Changes in deferred revenue    
Beginning balance 17,985  
Deferral of revenue 3,647  
Recognition of unearned revenue (4,913)  
Ending balance $ 16,719