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REVENUE - Contract Balances (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Contract With Customer, Liability [Roll Forward]  
Beginning balance $ 52,410
Upfront payments received from customers 25,146
Upfront or annual incentive payments received 2,959
Revenue recognized related to amounts that were included in beginning balance of deferred revenue (19,457)
Revenue recognized related to deferred revenue generated during the period (5,354)
Ending balance $ 55,704