Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2015

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of stock-based compensation expense

	Three months ended   June 30,				Six months ended   June 30,
	2015		2014		2015		2014
Product research and development	$	99	$	92	$	322	$	360
Sales and marketing		66		76		172		251
General and administrative		9		175		278		804
Total stock-based compensation expense	$	174	$	343	$	772	$	1,415

	Remaining unrecognized  expense at  June 30, 2015
Stock-based compensation	$	1,038

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

	For the six months ended
	June 30, 2015
Annual dividend yield	-
Expected life (years)	1.50 - 4.35
Risk-free interest rate	0.47% - 1.41%
Expected volatility	68% - 72%

Summary of all warrant activity

	June 30, 2015
Outstanding and exercisable	Warrants			Weighted Average Exercise Price		Weighted Average  Remaining Contractual Life
January 1, 2015		3,335,073		$	4.45		0.93
Granted		-			-		-
Expired/cancelled		(80,000	)		0.50		-
Exercised		-			-		-
Outstanding and exercisable, June 30, 2015		3,255,073		$	4.55		0.42

Employee Stock Option [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of all stock option plans / warrant activity

	Number of Options Outstanding			Weighted Average Exercise Price
Outstanding at January 1, 2015		1,709,400		$	4.92
Granted		590,000			3.56
Expired/forfeited		(3,200	)		86.25
Outstanding at June 30, 2015		2,296,200		$	4.46

Warrant [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of all stock option plans / warrant activity

Description	Issue  Date		Exercise Price		Shares		Expiration Date
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						3,255,073