Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2014

Stock-Based Compensation [Abstract]

Summary of stock-based compensation expense

	Three months ended  September 30,				Nine months ended   September 30,
	2014		2013		2014		2013
Product research and development	$	73	$	69	$	433	$	187
Sales and marketing		51		364		302		749
General and administrative		55		329		859		1,165
Total stock based compensation expense	$	179	$	762	$	1,594	$	2,101

	Remaining  unamortized  expense at  September 30,  2014
Stock-based compensation	$	965

Summary of combined activity under stock option plans

	Number of  Options  Outstanding			Weighted  Average  Exercise Price
Outstanding at January 1, 2014		1,600,583		$	5.22
Granted		365,000			6.77
Expired/forfeited		(142,494	)		11.74
Outstanding at September 30, 2014		1,823,089		$	5.02

Summary of assumptions used to value stock options granted to employees and directors

	For the nine months
		ended September 30, 2014
Annual dividend yield		-
Expected life (years)		1.50 – 4.30
Risk-free interest rate		0.27% - 1.47%
Expected volatility		61% - 109%

Summary of all warrant activity

	September 30, 2014
Outstanding and exercisable	Warrants			Weighted Average Exercise Price		Weighted Average  Remaining Contractual Life
January 1, 2014		828,573		$	2.39		2.06
Granted		2,575,000			5.09		--
Expired/cancelled		(40,000	)		3.98		--
Exercised		(28,500	)		2.85		--
Outstanding and exercisable, September 30, 2014		3,335,073		$	4.45		1.19

Summary of outstanding warrants to purchase common stock

Outstanding Warrants to Purchase  Common Stock as of September 30, 2014:
Description	Issue Date		Exercise Price		Shares		Expiration Date
August 2009 Employee Warrants		8/25/2009	$	0.50		80,000		8/25/2016
2007 Debt Extension Warrants		9/22/2010	$	1.00		16,000		9/22/2015
December 2010 Employee Warrants		12/3/2010	$	1.63		200,000		12/3/2015
February 2011 Legal Advisor Warrant		2/22/2011	$	2.50		80,000		2/22/2016
March  2011 Investor Warrants		3/9/2011	$	3.13		349,973		3/9/2016
March  2011 Investor Warrants		4/7/2011	$	3.13		34,100		4/7/2016
May 2014 Agent Warrant		5/15/2014	$	5.09		75,000		11/15/2015
May 2014 Investor Warrant		5/15/2014	$	5.09		2,500,000		11/15/2015
Total Warrants Outstanding						3,335,073