Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	Apr. 05, 2019	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Commitments and Contingencies [Line Items]
Derivative Liability		$ 6,122	$ 10,095	$ 24,976
Derivative Financial Instrument, Liabilities, Fair Value Disclosure, Noncurrent		0	1,474
Derivative Financial Instrument, Liabilities, Fair Value Disclosure, Current		6,122	8,621
Contingent Accrued Earn-out Acquisition Consideration [Member]
Commitments and Contingencies [Line Items]
Derivative Liability		6,100	10,100
Contingent liability for accrued earn-out acquisition consideration		0	1,500
Business Combination, Contingent Consideration, Liability, Current		$ 6,100	$ 8,600
Settled Litigation [Member]
Commitments and Contingencies [Line Items]
Loss Contingency, Damages Sought, Legal Expenses, Value	$ 19,650