Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Mar. 31, 2020 USD ($) employee
Accounting Policies [Abstract]
Number of employees | employee		21
Financing from sale proceeds, debt, and agreement revenues	$ 454,100
Cash and cash equivalents	$ 34,121	$ 28,052