Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									7 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	Jul. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net sales	$ 187	$ 1,036	$ 1,698	$ 2,336	$ 3,010	$ 4,345		$ 4,967	$ 6,192		$ 5,257	$ 18,514	$ 29,299
License and other revenue	1,277	1,241	1,259	3,230	1,267	1,350		1,453	3,471		7,007	7,541	6,420
Total revenue	1,464	2,277	2,957	5,566	4,277	5,695		6,420	9,663		12,264	26,055	35,719
Cost of sales	222	277	266	567	640	880		880	1,085		1,332	3,485	3,731
Write-down of inventory	(22)	933	373	370	119	129		2	135		1,654	385	2,274
Gross profit	1,264	1,067	2,318	4,629	3,518	4,686		5,538	8,443		9,278	22,185	29,714
Research and development	10,499	11,775	10,056	8,447	8,539	9,631		8,587	9,083		40,777	35,840	33,558
Selling, general and administrative	7,916	9,121	9,902	10,118	14,620	48,426		19,148	23,686		37,057	105,880	104,740
Impairment of intangible asset													31,269
Gain on settlement of payable						(256)			(3,875)			(4,131)
Total operating expenses	18,415	20,896	19,958	18,565	23,159	57,801		27,735	28,894		77,834	137,589	169,567
Loss from operations	(17,151)	(19,829)	(17,640)	(13,936)	(19,641)	(53,115)		(22,197)	(20,451)		(68,556)	(115,404)	(139,853)
Total other expense	1,476	1,874	4,674	3,315	1,716	64,049		14,837	12,407		11,339	93,009	7,232
Income tax expense (benefit)	(437)			316	27				315		(121)	342	(3)
Net loss	(18,190)	(21,703)	(22,314)	(17,567)	(21,384)	(117,164)		(37,034)	(33,173)		(79,774)	(208,755)	(147,082)
Deemed dividend on convertible preferred stock and Class E redeemable convertible units	490	490	469	469	469	21,264					1,918	21,733
Net loss attributable to common stockholders	$ (18,680)	$ (22,193)	$ (22,783)	$ (18,036)	$ (21,853)	$ (138,428)	[1]	$ (37,034)	$ (33,173)		$ (81,692)	$ (230,488)	$ (147,082)
Basic and diluted net loss per share of common stock	$ (0.24)	$ (0.42)	$ (0.44)	$ (0.39)	$ (0.48)	$ (4.24)		$ (4.46)	$ (4.00)		$ (1.42)	$ (9.74)	$ (18.10)
Weighted average basic and diluted shares of common stock outstanding	78,397,156	52,572,880	51,846,521	46,507,435	45,078,666	32,678,259	[2]	8,304,334	8,302,635		57,405,331	23,674,512	8,127,781
Beneficial conversion feature expense on convertible debt						$ 44,200						$ 44,170
Deemed dividends on preferred stock						20,900
Beneficial conversion feature expense on warrants						1,700						$ 1,745
2014 Long-Term Incentive Plan (“LTIP”) [Member]
Allocated Share-based Compensation Expense						$ 22,600				$ 0

[1] Net loss attributable to common stockholders for the three months ended September 30, 2016 includes the beneficial conversion feature of the Company's debt upon conversion into shares of the Company's common stock on August 1, 2016 of $44.2 million, the beneficial conversion feature of certain outstanding warrants which became exercisable into shares of the Company's common stock on August 1, 2016 of $1.7 million, the deemed dividends on the Company's convertible preferred stock and Class E redeemable convertible units of $20.9 million and share-based compensation expense related to the Company's LTIP of $22.6 million.

[2] Weighted average basic and diluted shares of common stock outstanding for the three months ended September 30, 2016 includes shares issued as a result of the Corporate Conversion (Note 1).