Basis of Presentation and Significant Accounting Policies - Contract Balances (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021
Changes in the Company's contract assets and contract liabilities
Contract asset, Beginning balance	$ 3,000
Contract asset, Additions		$ 0
Contract asset, Deductions	3,000
Contract liabilities:
Contract liabilities (deferred revenue), Beginning balance	92,068	110,109
Contract liabilities (deferred revenue), Additions	3,803
Contract liabilities (deferred revenue), Deductions	(36,624)	(837)
Contract liabilities (deferred revenue), Ending balance	$ 59,247	$ 109,272

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