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Liabilities - Customer Deposits and Deferred Revenue (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Liabilities    
Customer deposits and deferred revenue $ 57,800 $ 46,900
Changes in deferred revenue    
Beginning balance 16,276  
Deferral of revenue 5,284  
Recognition of unearned revenue (4,747)  
Ending balance $ 16,813