Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands				9 Months Ended
	Jul. 24, 2014	Feb. 05, 2014	Oct. 29, 2013	Sep. 30, 2015	Sep. 30, 2014	Jun. 22, 2015	Dec. 31, 2014	Jul. 21, 2014
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)				10,000,000			10,000,000
Preferred stock, par value (in dollars per share)				$ 0.10			$ 0.10
Preferred stock, shares issued (in shares)				6,505			11,787
Preferred stock, shares outstanding (in shares)				6,505			11,787
Liquidated damages paid to purchasers					$ 3,420
Total preferred stock value				$ 1			$ 1
Common stock, shares authorized (in shares)				150,000,000			150,000,000
Common stock, par value (in dollars per share)				$ 0.001			$ 0.001
Common stock, shares issued (in shares)			422,819	9,887,358			6,037,232
Common stock, shares outstanding (in shares)				9,887,358			6,037,232
Proceeds from issuance of common stock			$ 6,000,000	$ 0	$ 11,458
Class of Warrant or Right [Line Items]
Total Warrants (in shares)				16,078,920
Exercise price (in dollars per share)				$ 0.75		$ 0.75
Series A Warrants [Member]
Class of Stock [Line Items]
Common stock, par value (in dollars per share)				0.001				$ 0.001
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)	$ 2.45		$ 8.50	$ 0.75				$ 2.45
Warrants issued and outstanding to purchase common stock (in shares)			685,715	6,198,832				6,198,832
Series B warrants [Member]
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)	$ 2.45			$ 0.75
Warrants issued and outstanding to purchase common stock (in shares)			434,325
Common Stock Warrant One [Member]
Class of Warrant or Right [Line Items]
Issue Date				Apr. 26, 2013
Expiration Date				Apr. 26, 2018
Total Warrants (in shares)				69,321
Exercise price (in dollars per share)				$ 11.18
Common Stock Warrant Two [Member]
Class of Warrant or Right [Line Items]
Issue Date				Oct. 31, 2013
Expiration Date				Apr. 30, 2019
Total Warrants (in shares)				685,715
Exercise price (in dollars per share)				$ 0.75
Common Stock Warrant Three [Member]
Class of Warrant or Right [Line Items]
Issue Date				Feb. 05, 2014
Expiration Date				Feb. 05, 2019
Total Warrants (in shares)				1,329,731
Exercise price (in dollars per share)				$ 0.75
Common Stock Warrant Four [Member]
Class of Warrant or Right [Line Items]
Issue Date				Jul. 24, 2014
Expiration Date				Jul. 24, 2019
Total Warrants (in shares)				6,198,832
Common Stock Warrant Four [Member] | Minimum [Member]
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)				$ 0.75
Common Stock Warrant Four [Member] | Maximum [Member]
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)				$ 2.45
Common Stock Warrant Five [Member]
Class of Warrant or Right [Line Items]
Issue Date				Jul. 24, 2014
Expiration Date				Jan. 24, 2016
Total Warrants (in shares)				4,795,321
Exercise price (in dollars per share)				$ 0.75
Common Stock Warrant Six [Member]
Class of Warrant or Right [Line Items]
Issue Date				Jun. 22, 2015
Expiration Date				Jun. 22, 2020
Total Warrants (in shares)				3,000,000
Exercise price (in dollars per share)				$ 0.75
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)				6,505			11,787
Preferred stock, shares outstanding (in shares)				6,505			11,787
Number of preferred stock converted (in shares)	12,300			5,282.5
Conversion of convertible preferred stock, stated value (in dollars per share)	$ 1,000
Initial conversion price (in dollars per share)	$ 2.565
Total preferred stock value	$ 2,487
Intrinsic value of beneficial conversion feature	$ 1,887
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)	$ 2.45
Warrants issued and outstanding to purchase common stock (in shares)	4,795,321
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 0.10
Preferred stock, shares issued (in shares)		12,300
Number of preferred stock converted (in shares)	12,300
Conversion of convertible preferred stock, stated value (in dollars per share)		$ 1,000
Common Stock [Member]
Class of Stock [Line Items]
Number of shares issued upon conversion (in shares)	4,795,321			2,059,455
Common Stock Equivalents of Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 0.10
Preferred stock, shares issued (in shares)		12,300
Number of shares issued upon conversion (in shares)		1,464,287
Initial conversion price (in dollars per share)		$ 8.40
Proceeds from issuance of warrants		$ 11,458
Warrant term		5 years
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)		$ 7.40
Warrants issued and outstanding to purchase common stock (in shares)		1,329,731