STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Beginning Balance, shares at Dec. 31, 2014		3,021,498
Beginning Balance at Dec. 31, 2014	$ 14,741	$ 3	$ 99,360		$ (84,622)
Issuance of common stock for cash, net of offering costs, shares		6,003,082
Issuance of common stock for cash, net of offering costs	34,175	$ 6	34,169
Issuance of common stock upon vesting of Restricted Stock Units, shares		26,669
Issuance of common stock upon vesting of Restricted Stock Units, value	0	$ 0	0	$ 0	0
Adjustment for fractional shares		(32)
Share-based compensation	599		599
Net loss	$ (11,445)				(11,445)
Ending Balance, shares at Dec. 31, 2015	9,051,217	9,051,217
Ending Balance at Dec. 31, 2015	$ 38,070	$ 9	134,128		(96,067)
Issuance of common stock upon vesting of Restricted Stock Units, shares		29,486
Issuance of common stock upon vesting of Restricted Stock Units, value	0	$ 0	0	0	0
Share-based compensation	605		605
Change in unrealized loss on marketable securities	(6)			(6)
Other	11		11
Net loss	$ (12,200)				(12,200)
Ending Balance, shares at Sep. 30, 2016	9,080,703	9,080,703
Ending Balance at Sep. 30, 2016	$ 26,480	$ 9	$ 134,744	$ (6)	$ (108,267)