CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenues	$ 290	$ 405
Operating expenses:
General and administrative	1,412	1,293
Research and development	737	648
Total operating expenses	2,149	1,941
Operating loss	(1,859)	(1,536)
Other income/(expense):
Interest and other income/(expense), net	(1)	7
Net loss	$ (1,860)	$ (1,529)
Basic and diluted net loss per share (in dollars per share)	$ (0.11)	$ (0.09)
Shares used in computation of basic and diluted net loss per share (in shares)	17,264	16,540
Comprehensive Loss:
Net loss	$ (1,860)	$ (1,529)
Unrealized holding gain on securities available for sale	5	8
Comprehensive loss	$ (1,855)	$ (1,521)