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Revenues from Contracts with Customers - Summary of Contract Balances (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Revenue From Contract With Customer [Abstract]    
Trade accounts receivable, net of allowance for doubtful accounts $ 53,472 $ 58,254
Deferred revenues 6,731 7,430
Deferred revenues 4,278 4,852
Refund liability $ 2,119 $ 2,223