Summary of Significant Accounting Policies - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Intangible assets, net	$ 41,259,000	$ 0
Required milestone payments capitalized to intangible asset	41,500,000
Intangible asset amortization	241,000
Prepaid rent	2,850,000
Restricted cash	$ 1,000,000	$ 1,000,000
General payment terms, minimum	30 days
General payment terms, maximum	65 days