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Basis of Presentation and Summary of Significant Accounting Policies - Net loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Jul. 12, 2017	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2020
Net loss per share
Anti dilutive shares														5,247,005	4,463,597	4,590,520
Net loss attributable to common stockholders		$ (304,681)	$ (132,173)	$ (42,485)	$ (33,086)	$ (87,427)	$ (29,720)	$ (31,423)	$ (24,892)	$ (75,571)	$ (56,314)	$ (207,744)	$ (86,035)	$ (512,425)	$ (173,461)	$ (228,348)
Weighted average common shares outstanding - basic and diluted														145,718,936	147,773,089	104,914,382
Loss per share - Basic and diluted (in dollars per share)		$ (2.09)	$ (0.91)	$ (0.29)	$ (0.23)	$ (0.59)	$ (0.20)	$ (0.21)	$ (0.17)					$ (3.52)	$ (1.17)	$ (2.18)
Common stock, shares returned																	4,570,734
Series A Preferred Stock
Net loss per share
Number of anti-dilutive shares excluded from computation of diluted loss per share														5,250,129
Warrants
Net loss per share
Number of anti-dilutive shares excluded from computation of diluted loss per share	35,000,000