Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

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

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

	For the six months ended
	June 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 stock-based compensation expense

	Three months ended  June 30,				Six months ended   June 30,
	2014		2013		2014		2013
Product research and development	$	92	$	58	$	360	$	118
Sales and marketing		76		194		251		385
General and administrative		175		501		804		836
Total stock based compensation expense	$	343	$	753	$	1,415	$	1,339

	Remaining unamortized expense at June 30, 2014
Stock-based compensation	$	1,657

Summary of all warrant activity

	June 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		(20,000	)		4.05		-
Exercised		(28,500	)		2.85		-
Outstanding and exercisable, June 30, 2014		3,355,073		$	4.45		1.44

Summary of outstanding warrants to purchase common stock

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
September 2011 Employee Warrant	9/12/2011	$	3.90	20,000	9/12/2014
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				3,355,073

Stock Options [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, 2014		1,600,583		$	5.22
Granted		335,000			7.09
Expired		(600	)		58.25
Outstanding at June 30, 2014		1,934,983		$	5.53