Consolidated Statements Of Stockholders' Equity/(Deficit) - USD ($) $ in Thousands	Total	Series F	Preferred Stock Series B	Preferred Stock Series F	Common Stock	Additional paid-in capital	Additional paid-in capital Series F	Other Comprehensive Loss	Accumulated deficit
Balances, shares, beginning balance at Dec. 31, 2015			44,000	0	9,561,000
Balances, beginning balance at Dec. 31, 2015	$ (1,459)		$ 0	$ 0	$ 96	$ 228,512		$ 0	$ (230,067)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid on Series B Preferred Stock	(295)								(295)
Kien Huat note conversion, shares					1,332,000
Kien Huat note conversion	17,426				$ 14	17,412
Stock Grant to Horseman, shares					20,139,000
Stock Grant to Horsemen	$ 286,003				$ 201	285,802
Options exercised, shares	18,000
Stock-based compensation	$ 2,122					2,122
Stock issued for legal settlement, shares					124,000
Stock issued for legal settlement	34				$ (1)	35
Net loss	(24,197)								(24,197)
Balances, shares, endings balance at Dec. 31, 2016			44,000	0	31,156,000
Balances, ending balance at Dec. 31, 2016	279,566		$ 0	$ 0	$ 312	533,813		0	(254,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid on Series B Preferred Stock	(129)								(129)
Kien Huat note conversion, shares					1,380,000
Kien Huat note conversion	$ 35,889				$ 14	35,875
Options exercised, shares	2,000				2,000
Options and Option Matching Rights exercised	$ 16					16
Restricted stock forfeited for tax payment, shares					(12,000)
Restricted stock forfeited for tax payment	(275)					(275)
Stock-based compensation	2,155					2,155
Stock issued for legal settlement, shares					34,000
Stock issued for legal settlement	758					758
Comprehensive loss	(315)							(315)
Net loss	(46,344)								(46,344)
Balances, shares, endings balance at Dec. 31, 2017			44,000	0	32,560,000
Balances, ending balance at Dec. 31, 2017	271,321		$ 0	$ 0	$ 326	572,342		(315)	(301,032)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(26,233)
Balances, ending balance at Mar. 31, 2018	248,979
Balances, shares, beginning balance at Dec. 31, 2017			44,000	0	32,560,000
Balances, beginning balance at Dec. 31, 2017	271,321		$ 0	$ 0	$ 326	572,342		(315)	(301,032)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(63,230)
Balances, ending balance at Jun. 30, 2018	212,593
Balances, shares, beginning balance at Dec. 31, 2017			44,000	0	32,560,000
Balances, beginning balance at Dec. 31, 2017	271,321		$ 0	$ 0	$ 326	572,342		(315)	(301,032)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(97,122)
Balances, ending balance at Sep. 30, 2018	179,672
Balances, shares, beginning balance at Dec. 31, 2017			44,000	0	32,560,000
Balances, beginning balance at Dec. 31, 2017	271,321		$ 0	$ 0	$ 326	572,342		(315)	(301,032)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends paid on Series B Preferred Stock	(128)								(128)
Kien Huat note conversion	96							96
Stock Grant to Horseman, shares					200,000
Stock Grant to Horsemen	4,720				$ 2	4,718
Stock issuance, shares					1,686,000
Stock issued	$ 30,568	$ 43,003		$ 1	$ 16	30,552	$ 43,002
Options exercised, shares	1,700				3,000
Options and Option Matching Rights exercised	$ 50					50
Stock-based compensation	1,926					1,926
Stock issued for legal settlement, shares					(46,000)
Stock issued for legal settlement	(967)					(967)
Net loss	(138,696)								(138,696)
Balances, shares, endings balance at Dec. 31, 2018			44,000	0	34,403,000
Balances, ending balance at Dec. 31, 2018	211,839		$ 0	$ 1	$ 344	$ 651,623		$ (219)	$ (439,910)
Balances, beginning balance at Mar. 31, 2018	248,979
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(36,997)
Balances, ending balance at Jun. 30, 2018	212,593
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(33,892)
Balances, ending balance at Sep. 30, 2018	$ 179,672