Going Concern (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Net loss	$ (39,603)	$ (44,492)	$ (82,821)	$ (90,844)
Net Cash Used In Operating Activities			(80,621)	$ (106,046)
Cash Cash Equivalents Marketable Securities Restricted Cash and Restricted Cash Equivalents	$ 78,200		$ 78,200
Accounting Year 2018 [Member]
Net loss					$ 184,700
Net Cash Used In Operating Activities					$ 184,800