Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Statutory income tax rate	21.00%	35.00%
Income tax adjustment	$ 60,400
Rate change - decrease in valuation allowance	408,903	$ 336,417
Tax credit valuation allowance		207
Gross unrecognized tax benefits	18,300	18,500
Penalties and interest accrued	100	100
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	1,200,000	1,200,000
Operating loss carryforwards, indefinite lived	174,900	33,500
Federal and state
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards valuation allowance	318,400	245,300
Tax credit valuation allowance	49,800	49,800
Capital loss carryforward | Federal
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	161,600
Capital loss carryforward | Federal and state
Operating Loss Carryforwards [Line Items]
Tax credit valuation allowance	$ 40,700	$ 41,400