Description of Business and Summary of Significant Accounting Policies - Receivables and Deferred Revenue (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Contract Balances [Roll Forward]
Opening balance, Receivable	$ 87,620
Ending balance, Receivable	80,423
Opening balance, Contract Acquisition Costs (noncurrent)	32,000
Ending balance, Contract Acquisition Costs (noncurrent)	41,000
Opening balance, Deferred Revenue (current)	88,751
Increase (decrease) in current deferred revenue, net	97
Ending balance, Deferred Revenue (current)	88,848
Opening balance, Deferred revenue (long-term)	438
Increase (decrease) in long-term deferred revenue, net	(29)
Ending balance, Deferred revenue (long-term)	409
Accounts Receivable
Contract Balances [Roll Forward]
Opening balance, Receivable	70,318
Increase (decrease) in receivables, net	(8,517)
Ending balance, Receivable	61,801
Unbilled Receivable
Contract Balances [Roll Forward]
Opening balance, Receivable	17,302
Increase (decrease) in receivables, net	1,320
Ending balance, Receivable	18,622
Opening balance, Contract Acquisition Costs (noncurrent)	31,965
Increase (decrease) in contract acquisition costs noncurrent, net	9,056
Ending balance, Contract Acquisition Costs (noncurrent)	$ 41,021