Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 19, 2020
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)	$ (1,994)	$ 3,040	$ (9,030)
Deferred tax asset, valuation allowance	3,456	1,238
Deferred Tax Liabilities, Intangible Assets	91,283	707		$ 92,300
Uncertain tax positions	5,292	5,292	9,788
Total liabilities for uncertain tax positions including interest and penalties	29,900	27,000
Interest accruals	23,500	20,700
Penalty accruals	1,000
Income tax expense (benefit) of uncertain tax positions	2,818	(13,156)	3,227
Tax indemnification receivable	20,800	18,900
Tax indemnification (income) expense, net	(2,218)	10,635	(2,855)
Canada
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)			$ 4,000
UK
Operating Loss Carryforwards [Line Items]
Deferred tax asset, valuation allowance		1,200
Sweden
Operating Loss Carryforwards [Line Items]
Deferred tax assets, net of valuation allowance		2,100
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryovers	492,500			338,700
Operating loss carryforwards expire	354,500
Operating loss carried forward	138,000
Federal | 2037
Operating Loss Carryforwards [Line Items]
Net operating loss carryovers	2,400
State Research Credit
Operating Loss Carryforwards [Line Items]
Deferred tax assets, net of valuation allowance		$ 100
Net operating loss carryovers	18,000			12,500
Tax credits	4,200			$ 2,500
Investment Tax Credit Carryforward | Massachusetts
Operating Loss Carryforwards [Line Items]
Tax credits	2,600
Net operating loss carryovers without expiration date	700
Tax credits subject to expiration	$ 1,800