Stockholders' Equity (Deficit) (Details Textual) - USD ($)				1 Months Ended							3 Months Ended			6 Months Ended
	Jun. 14, 2017	Apr. 14, 2017	Mar. 10, 2017	Jul. 17, 2017	Jun. 05, 2017	May 31, 2017	May 22, 2017	Mar. 31, 2017	Mar. 30, 2017	Mar. 17, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Oct. 17, 2017	Dec. 31, 2016
Shareholders Deficit [Line Items]
Shares Issued, Price Per Share		$ 0.26			$ 0.14		$ 0.18				$ 0.15			$ 0.15
Proceeds from Warrant Exercises												$ 31,000		$ 100,000	$ 4,235,000
Debt Conversion, Converted Instrument, Amount					$ 500,000		$ 2,000,000							$ 451,000	0
Stock Issued During Period, Shares, New Issues		1,384,615								18,800,000	3,610,452
Debt Conversion, Converted Instrument, Shares Issued					3,300,000		11,137,345
Proceeds from Issuance of Common Stock		$ 360,000									$ 552,000
Class of Warrant or Right, Exercise Price of Warrants or Rights											$ 0.33			$ 0.33
Class of Warrant or Right, Number of Securities Called by Warrants or Rights										0.01	3,274,553			3,274,553
Proceeds from Issuance or Sale of Equity										$ 7,500,000
Warrants Not Settleable in Cash, Fair Value Disclosure								$ 713,000				$ 713,000
Gain (Loss) on Extinguishment of Debt					$ (400,000)		$ (700,000)				$ (7,007,000)		$ 0	$ (8,542,000)	$ 0
Shares Issued During Period Shares, Upon Exercise Of warrants												3,100,000
Warrants and Rights Outstanding					300,000	$ 1,600,000	900,000
Debt Instrument, Face Amount											32,664,000			32,664,000			$ 32,561,000
Common Stock, Value, Outstanding					$ 600,000	3,900,000	$ 1,800,000
Long-term Debt											$ 32,026,000			$ 32,026,000			$ 31,711,000
Class Of Warrants Or Rights Number Of Ratchet Warrants											1,000,000			1,000,000
Senior Convertiable Note [Member]
Shareholders Deficit [Line Items]
Debt Conversion, Converted Instrument, Amount			$ 1,500,000
Debt Conversion, Converted Instrument, Shares Issued			4,039,860								3,050,000
Debt Instrument, Face Amount			$ 11,000,000								$ 11,000,000			$ 11,000,000
Share Settled Debt [Member]
Shareholders Deficit [Line Items]
Debt Conversion, Converted Instrument, Shares Issued	1,000,000								2,500,000					3,500,000
Long-term Debt											4,700,000			$ 4,700,000
2014 Senior Convertible Notes [Member]
Shareholders Deficit [Line Items]
Debt Conversion, Converted Instrument, Amount						$ 3,000,000
Debt Conversion, Converted Instrument, Shares Issued						20,628,571
Gain (Loss) on Extinguishment of Debt											(500,000)
Series A Warrants [Member]
Shareholders Deficit [Line Items]
Sale of Stock, Price Per Share										$ 0.26
Class of Warrant or Right, Exercise Price of Warrants or Rights										$ 0.26
Class of Warrant or Right, Number of Securities Called by Warrants or Rights										21,600,000
Class of Warrants, Expiration Term										5 years
Series B Warrants [Member]
Shareholders Deficit [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights										$ 1.00
Class of Warrant or Right, Number of Securities Called by Warrants or Rights										21,600,000
Series C Warrants [Member]
Shareholders Deficit [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights								$ 0.26		$ 0.26		$ 0.26
Class of Warrant or Right, Number of Securities Called by Warrants or Rights										10,000,000
Class Of Warrant Or Right Prefunded Exercise Price								$ 0.25		$ 0.25		$ 0.25
Warrants and Rights Outstanding								$ 6,200,000				$ 6,200,000
Class A Warrant [Member]
Shareholders Deficit [Line Items]
Stock Issued During Period, Shares, New Issues				6,939,934
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 0.26					$ 0.26
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		1,038,461		16,071,428			8,353,009
Class of Warrants, Expiration Term		5 years					5 years
Class B Warrant [Member]
Shareholders Deficit [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 1.00					$ 1.00									$ 1.00
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		1,038,461		1,038,460			8,353,009
Class of Warrants, Expiration Term		3 months					90 days	90 years
Class D Warrant [Member]
Shareholders Deficit [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 0.175
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					2,475,000
Class of Warrant or Right, Warrant Term					2 years
Warrant [Member]
Shareholders Deficit [Line Items]
Proceeds from Warrant Exercises											$ 69,000
Stock Issued During Period, Shares, New Issues														6,900,000
Debt Conversion, Converted Instrument, Shares Issued							8,333,334
Class of Warrant or Right, Exercise Price of Warrants or Rights											$ 0.01			$ 0.01
Warrants and Rights Outstanding											$ 1,100,000			$ 1,100,000
Warrant [Member] | 2014 Senior Convertible Notes [Member]
Shareholders Deficit [Line Items]
Stock Issued During Period, Shares, New Issues						800,000
Class of Warrant or Right, Exercise Price of Warrants or Rights						$ 0.175
Class of Warrant or Right, Number of Securities Called by Warrants or Rights						16,071,428
Class of Warrant or Right, Warrant Term						2 years