Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accumulated depreciation	$ 778	$ 702
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	10,000,000
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	65,349,121	21,984,272
Common stock, shares outstanding	65,349,121	21,984,272
Series A Convertible Preferred Stock [Member]
Series A Preferred Stock, par value	$ 0.0001	$ 0.0001
Series A Preferred Stock, shares authorized	0	15,000
Series A Preferred Stock, shares issued	0	5,110
Series A Preferred Stock, shares outstanding	0	5,110
Series A-1 Convertible Preferred Stock [Member]
Series A-1 Preferred Stock, par value	$ 0.0001	$ 0.0001
Series A-1 Preferred Stock, shares authorized	0	10,000
Series A-1 Preferred Stock, shares issued	0	1,578
Series A-1 Preferred Stock, shares outstanding	0	1,578