Warrants (Details) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 22, 2015 USD ($) $ / shares	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) shares $ / shares	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) $ / shares	Jul. 24, 2014 $ / shares	Jul. 21, 2014 $ / shares shares	Oct. 29, 2013 $ / shares shares
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair value of warrants	$ 2,959	$ 2,561		$ 2,561
Exercise price of warrants (in dollars per share) | $ / shares	$ 0.75	$ 0.75		$ 0.75
Modification of warrants				$ 5,399
Deemed dividend		$ 2,962	$ 0	$ 2,962	$ 0
Fair Value Assumptions [Abstract]
Stock price (in dollars per share) | $ / shares	$ 1.38	$ 1.14		$ 1.14
Volatility	90.00%			90.00%
Risk-free interest rate	1.62%			1.30%
Expected dividend yield	0.00%			0.00%
Expected warrant life	5 years			4 years 8 months 23 days
7/24/2014 Series A [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants issued to purchase common stock (in shares) | shares		6,198,832		6,198,832				6,198,832	685,715
Exercise price of warrants (in dollars per share) | $ / shares		$ 0.75		$ 0.75			$ 2.45	$ 2.45	$ 8.50
Number of warrants | shares				4,288,500
7/24/2014 Series B [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants issued to purchase common stock (in shares) | shares									434,325
Exercise price of warrants (in dollars per share) | $ / shares		$ 0.75		$ 0.75			$ 2.45
Number of warrants | shares				4,795,321
Warrant [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Warrants issued to purchase common stock (in shares) | shares		3,000,000		3,000,000
Fair value of warrants		$ 2,958		$ 2,958
Debentures in excess held by the investors		$ 5,000		$ 5,000
Exercise price of warrants (in dollars per share) | $ / shares		$ 0.75		$ 0.75
Modification of warrants				$ 5,399
Deemed dividend				2,962
Fair value of warrants adjustment (income) expense		$ 1,329	$ (2,108)	$ 679	$ (7,151)
Fair Value Assumptions [Abstract]
Stock price (in dollars per share) | $ / shares	$ 1.38	$ 1.14		$ 1.14		$ 1.20
Volatility	90.00%			90.00%
Risk-free interest rate	1.62%					1.65%
Expected dividend yield	0.00%			0.00%		0.00%
Expected warrant life	5 years
Warrant [Member] | Minimum [Member]
Fair Value Assumptions [Abstract]
Volatility						72.90%
Risk-free interest rate				0.02%
Expected warrant life				3 months 25 days		4 years 1 month 6 days
Warrant [Member] | Maximum [Member]
Fair Value Assumptions [Abstract]
Volatility						88.10%
Risk-free interest rate				1.30%
Expected warrant life				4 years 8 months 23 days		4 years 3 months 29 days
Warrant [Member] | Level 3 [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]
Balance as beginning of period				$ 499
Initial measurements				2,958
Increase (decrease) in fair value				679
Reclassed from equity				5,399
Balance as end of period		$ 9,535		9,535		$ 499
Warrant [Member] | Level 3 [Member] | 10/31/2013 [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]
Balance as beginning of period				233
Initial measurements				0
Increase (decrease) in fair value				309
Reclassed from equity				0
Balance as end of period		542		542		233
Warrant [Member] | Level 3 [Member] | 2/5/2014 [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]
Balance as beginning of period				266
Initial measurements				0
Increase (decrease) in fair value				767
Reclassed from equity				0
Balance as end of period		1,033		1,033		266
Warrant [Member] | Level 3 [Member] | 7/24/2014 Series A [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]
Balance as beginning of period				0
Initial measurements				0
Increase (decrease) in fair value				0
Reclassed from equity				3,452
Balance as end of period		3,452		3,452		0
Warrant [Member] | Level 3 [Member] | 7/24/2014 Series B [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]
Balance as beginning of period				0
Initial measurements				0
Increase (decrease) in fair value				0
Reclassed from equity				1,947
Balance as end of period		1,947		1,947		0
Warrant [Member] | Level 3 [Member] | 6/22/2015 [Member]
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Abstract]
Balance as beginning of period				0
Initial measurements				2,958
Increase (decrease) in fair value				(397)
Reclassed from equity				0
Balance as end of period		$ 2,561		$ 2,561		$ 0