Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Tax Benefit	$ 0	$ (6,014)	$ 0
Valuation Allowance, Deferred Tax Asset, Change in Amount	20,400
Operating Loss Carryforwards, Federal	918,100
Operating Loss Carryforwards, State	86,900
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0	0
Investments, Owned, Federal Income Tax Note [Line Items]
Deferred Tax Liability Related to Acquisition of Symphony Icon	0	4,140
Deferred Tax Assets, Tax Credit Carryforwards, Research	$ 29,304	$ 46,306