Revenue Recognition - Accounts Receivable and Deferred Revenue (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Accounts receivable	$ 110,416	$ 78,565
Liabilities:
Deferred revenue, current portion	9,667	50,125
Deferred revenue, long-term portion	22,706	22,805
Total deferred revenues	$ 32,373	$ 72,930

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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