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Liabilities - Customer Deposits and Deferred Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Liabilities    
Customer deposits and deferred revenue $ 24,900 $ 26,600
Changes in deferred revenue    
Beginning balance 28,249  
Deferral of revenue 5,089  
Recognition of previously deferred revenue (8,607)  
Ending balance $ 24,731