Fair Value Measurements (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Warrant liability
Liabilities
September 2020 Warrants	$ (79,400)	$ (23,900)
Level 1
Assets
Fair value of derivatives	0		$ 0
Contingent consideration arrangements	0		0
Liabilities
Fair value of derivatives	0		0
Contingent consideration arrangements	0		0
Total net assets (liabilities)	0		0
Level 1 \| Warrant liability
Liabilities
September 2020 Warrants	0
Level 2
Assets
Fair value of derivatives	921		9,338
Contingent consideration arrangements	1,816		25,934
Liabilities
Fair value of derivatives	(97,060)		(34,132)
Contingent consideration arrangements	(8,618)		(69,760)
Total net assets (liabilities)	(102,941)		(68,620)
Level 2 \| Warrant liability
Liabilities
September 2020 Warrants	0
Level 3
Assets
Fair value of derivatives	0		0
Contingent consideration arrangements	0		0
Liabilities
Fair value of derivatives	0		0
Contingent consideration arrangements	0		0
Total net assets (liabilities)	(79,428)		0
Level 3 \| Warrant liability
Liabilities
September 2020 Warrants	$ (79,428)		$ 0

Amount of asset recognized arising from contingent consideration in a business combination.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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