CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net loss	$ (1,860)	$ (1,529)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	26	23
Bad debt expense		24
Non-cash charges for stock-based compensation	202	194
Non-cash consideration for release of security interest	4
Changes in current assets and liabilities, net	(138)	(760)
Changes in non-current liabilities, net	(3)	6
Net cash used in operating activities	(1,769)	(2,042)
Cash flows from investing activities:
Proceeds from maturities of investment securities	1,087	1,224
Net cash provided by investing activities	1,087	1,224
Change in cash and cash equivalents	(682)	(818)
Beginning balance of cash and cash equivalents	7,015	7,968
Ending balance of cash and cash equivalents	$ 6,333	$ 7,150