CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 9,400	$ 5,008	$ 2,314	$ 98	$ 0	$ 0	$ 0	$ 0	$ 16,820	$ 0	$ 0
Cost of goods sold	3,820	1,722	1,643	1,626					8,811	0	0
Gross profit	5,580	3,286	671	(1,528)					8,009	0	0
Costs and Expenses:
Research and development	1,990	5,876	22,069	18,411	16,406	24,065	25,906	20,679	48,346	87,056	78,028
Selling, general and administrative	41,779	45,110	52,185	42,788	25,992	14,417	10,954	6,871	181,862	58,230	21,794
Loss from Operations	(38,189)	(47,700)	(73,583)	(62,727)	(42,398)	(38,482)	(36,860)	(27,550)	(222,199)	(145,286)	(99,822)
Other Income/(Loss)
Interest expense, net	2,909	(1,226)	(345)	(790)	(3,007)	(1,674)	(1,673)	(7,036)	(5,270)	(13,390)	(17,284)
Debt conversion expense	0	0	0	(1,209)	(14,543)	0	0	(25,615)	(1,209)	(40,158)	0
State R&D tax credits					126	0	0	0	0	121	0
Change in fair value of derivative instruments-warrants	4,124	55	39	122	(45)	(87)	(23)	260	4,340	106	(394)
Total Other Loss	1,215	(1,171)	(306)	(1,877)	(17,469)	(1,761)	(1,696)	(32,391)	(2,139)	(53,321)	(17,678)
Net loss	$ (36,974)	$ (48,871)	$ (73,889)	$ (64,604)	$ (59,867)	$ (40,243)	$ (38,556)	$ (59,941)	$ (224,338)	$ (198,607)	$ (117,500)
Weighted Average Common Shares Outstanding
Basic and Diluted (in shares)	235,924,350	224,954,941	224,948,622	215,484,670	190,093,786	179,786,580	168,127,144	117,626,669	225,439,121	164,437,548	105,570,960
Net Loss per Common Share, Basic and Diluted (in dollars per share)	$ (0.16)	$ (0.22)	$ (0.33)	$ (0.30)	$ (0.31)	$ (0.22)	$ (0.23)	$ (0.51)	$ (1.00)	$ (1.21)	$ (1.11)