STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]		Additional Paid-in Capital [Member]	Accumulated deficit [Member]
Balance at Dec. 31, 2013	$ 18,423	$ 2		$ 100,126	$ (81,705)
Balance (in shares) at Dec. 31, 2013		18,497,307
Stock-based compensation related to the issuance and vesting of restricted common stock to directors and an employee	371	$ 0	[1]	371	0
Stock-based compensation related to the issuance and vesting of restricted common stock to directors and an employee (in shares)		23,000
Stock-based compensation related to options and warrants granted to consultants, directors and employees	4,512	$ 0		4,512	0
Exercise of warrants and options	1,243	$ 0	[1]	1,243	0
Exercise of warrants and options (in shares)		364,096
Loss	(12,237)	$ 0		0	(12,237)
Balance at Sep. 30, 2014	12,312	$ 2		106,252	(93,942)
Balance (in shares) at Sep. 30, 2014		18,884,403
Balance at Dec. 31, 2014	29,662	$ 3		129,797	(100,138)
Balance (in shares) at Dec. 31, 2014		24,818,075
Stock-based compensation related to vesting of restricted common stock to directors	0	$ 0	[1]	0	0
Stock-based compensation related to vesting of restricted common stock to directors (in shares)		24,500
Stock-based compensation related to options and warrants granted to consultants, directors and employees	7,638	$ 0		7,638	0
Exercise of warrants and options	3,410	$ 0	[1]	3,410	0
Exercise of warrants and options (in shares)		480,122
Loss	(31,529)	$ 0		0	(31,529)
Balance at Sep. 30, 2015	$ 9,181	$ 3		$ 140,845	$ (131,667)
Balance (in shares) at Sep. 30, 2015		25,322,697

[1] Represents an amount lower than $ 1.