Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2015

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

Summary of stock-based compensation expense

	Three months ended   September 30,				Nine months ended   September 30,
	2015		2014		2015		2014
Product research and development	$	100	$	73	$	422	$	433
Sales and marketing		68		51		240		302
General and administrative		8		55		286		859
Total stock-based compensation expense	$	176	$	179	$	948	$	1,594

	Remaining unrecognized  expense at  September 30, 2015
Stock-based compensation	$	862

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

	For the nine months ended
	September 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

	September 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		(16,000	)		1.00		--
Exercised		(80,000	)		0.50		--
Outstanding and exercisable, September 30, 2015		3,239,073		$	4.57		0.17

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		(3,200	)		86.25
Outstanding at September 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
December 2010 Employee Warrants	12/3/2010	$	1.63		200,000	12/3/2015
February 2011 Legal Advisor Warrant	2/22/2011	$	2.00		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					3,239,073