Consolidated Statements of Preferred Stock and Stockholders' Equity (USD $) In Thousands, except Share data	Total USD ($)	Common Stock USD ($)	Additional Paid-in Capital USD ($)	Accumulated Deficit USD ($)	Convertible Preferred Stock Preferred Stock
Beginning Balance, value at Dec. 31, 2012	$ 2,907	$ 3	$ 70,898	$ (67,994)
Beginning Balance, shares at Dec. 31, 2012		2,660,315
Issuance of common stock for cash, net of offering costs	1,421		1,421
Issuance of common stock for cash, net of offering costs, shares		521,066
Adjustment for fractional shares		(64)
Issuance of common stock upon exercise of warrants for cash, value	12		12
Issuance of common stock upon exercise of warrants for cash, share		4,245
Issuance of Series A convertible preferred stock, net of offering costs	17,917		17,917
Issuance of Series A convertible preferred stock, net of offering costs, shares					125,000
Deemed preferred stock dividend for beneficial conversion feature	2,026		2,026
Less: Deemed preferred stock dividend	(2,026)		(2,026)
Conversion of preferred stock	(20)	13	(33)
Conversion of preferred stock, shares		12,500,000			(125,000)
Share-based compensation	283		283
Net loss	(6,939)			(6,939)
Ending Balance, value at Dec. 31, 2013	15,581	16	90,498	(74,933)
Ending Balance, shares at Dec. 31, 2013		15,685,562
Issuance of common stock for cash, net of offering costs	7,866	5	7,861
Issuance of common stock for cash, net of offering costs, shares		5,116,228
Issuance of common stock upon exercise of warrants for cash, value	338		338
Issuance of common stock upon exercise of warrants for cash, share		209,025
Issuance of common stock upon vesting of Restricted Stock Awards, shares		129,671
Share-based compensation	491		491
Net loss	(7,078)			(7,078)
Ending Balance, value at Sep. 30, 2014	$ 17,198	$ 21	$ 99,188	$ (82,011)
Ending Balance, shares at Sep. 30, 2014		21,140,486