Consolidated Statements Of Stockholders' Deficit - USD ($) $ in Thousands	Total	Series A Preferred Stock	Preferred Shares	Preferred Shares Series A Preferred Stock	Common Shares	Treasury Stock	Additional Paid-in Capital	Additional Paid-in Capital Series A Preferred Stock	Accumulated Deficit
Balance (in shares) at Dec. 31, 2013					172,691,063	(20,079)
Balance at Dec. 31, 2013	$ (33,856)				$ 141,477	$ (217)	$ 738,754		$ (913,870)
Exercise of warrants (in shares)					1,684,888
Exercise of warrants	1,651				$ 1,443		208
Exercise of stock options (in shares)					234,500
Exercise of stock options	307				$ 193		114
Reacquisition of conversion option in convertible notes	(10,100)						(10,100)
Tax provision on stock-based compensation	(2,299)						(2,299)
Stock-based compensation	9,022						9,022
Refund of equity issuance costs	3,191						3,191
Net loss	(56,364)								(56,364)
Balance (in shares) at Dec. 31, 2014					174,610,451	(20,079)
Balance at Dec. 31, 2014	(88,448)				$ 143,113	$ (217)	738,890		(970,234)
Issuance of stock		$ 57,853		$ 29,168				$ 28,685
Issuance of stock (shares)				391,017,970
Conversion of Series A Convertible Preferred Stock, net (in shares)			(62,833,330)		6,283,333
Conversion of Series A Convertible Preferred Stock, net	(187)		$ (4,804)		$ 4,804		(187)
Preferred stock purchase option	$ 946						1,814		(868)
Preferred stock beneficial conversion features							32,987		(32,987)
Exercise of warrants (in shares)	1,844,585				1,844,585
Exercise of warrants	$ 2,713				$ 1,429		1,284
Exercise of stock options (in shares)	18,020				18,020
Exercise of stock options	$ 31				$ 13		18
Vesting of restricted stock units (in shares)					821,376	(154,423)
Vesting of restricted stock units	(194)				$ 619	$ (194)	(619)
Reacquisition of conversion option in convertible notes	(1,300)						(1,300)
Tax benefits realized from stock-based compensation	727						727
Stock-based compensation	13,872						13,872
Net loss	(115,204)								(115,204)
Balance (in shares) (Scenario, Previously Reported) at Dec. 31, 2015			328,184,640		183,577,765	(174,502)
Balance (in shares) at Dec. 31, 2015			328,184,640		183,577,765	(174,502)
Balance (Scenario, Previously Reported) at Dec. 31, 2015	(129,191)		$ 24,364		$ 149,978	$ (411)	816,171		(1,119,293)
Balance (Cumulative-effect adjustment)	1,639								1,639
Balance at Dec. 31, 2015	(127,552)		$ 24,364		149,978	$ (411)	816,171		(1,117,654)
Issuance of stock	64,613				$ 15,712		48,901
Issuance of stock (shares)					24,265,000
Exchange of exchangeable senior notes, net of transaction costs	$ 127,436				$ 40,062		87,374
Conversion of Series A Convertible Preferred Stock, net (in shares)					60,311,188
Exercise of stock options (in shares)	177,146				177,146
Exercise of stock options	$ 287				$ 119		168
Vesting of restricted stock units (in shares)					1,852,102	(645,003)
Vesting of restricted stock units	(1,094)				$ 1,295	$ (1,087)	(1,302)
Stock-based compensation	13,602						13,602
Net loss	(86,350)								(86,350)
Balance (in shares) at Dec. 31, 2016			328,184,640		270,183,201	(819,505)
Balance at Dec. 31, 2016	$ (9,058)		$ 24,364		$ 207,166	$ (1,498)	$ 964,914		$ (1,204,004)