Nature of Business and Plan of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Net loss			$ (108,947)	$ (127,044)
Accumulated deficit	$ (1,292,282)		(1,292,282)		$ (1,183,335)
Total revenues	13,281	$ 10,928	37,407	40,030
Cash and cash equivalents	$ 204,491	$ 303,205	$ 204,491	$ 303,205	$ 262,252	$ 267,107
Number of months Capital resources meets capital expenditures			12 months
Product
Total revenues			$ 0