Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

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

Summary of options outstanding by exercise price range

Options Outstanding					Options Exercisable
Range of Exercise Price	Number Outstanding at 12/31/14		Weighted Average Remaining Contractual Life (years)		Weighted Average Exercise Price		Number Exercisable at 12/31/14		Weighted Average Exercise Price
$ 2.08 - $ 3.50		70,200		6.70	$	2.61		-	$	-
$ 3.51 - $ 5.00		1,221,000		4.33	$	4.24		1,211,834	$	4.25
$ 5.01 - $ 6.50		245,000		5.57	$	5.90		91,383	$	5.62
$ 6.51 - $ 10.00		170,000		3.79	$	7.83		138,334	$	7.93
$ 10.01 - $ 86.25		3,200		0.01	$	86.25		3,200	$	86.25
		1,709,400		4.54	$	4.92		1,444,751	$	4.87

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

	For the year
	ended December 31, 2014
Annual dividend yield	-
Expected life (years)	3.5
Risk-free interest rate	0.28% - 1.47%
Expected volatility	60.68% - 108.75%

	For the year
	ended December 31, 2013
Annual dividend yield	-
Expected life (years)	4.3
Risk-free interest rate	0.65% - 2.15%
Expected volatility	117% - 154%

	For the year
	ended December 31, 2012
Annual dividend yield	-
Expected life (years)	3.8 - 4.3
Risk-free interest rate	0.43% - 0.62%
Expected volatility	169% - 187%

Summary of stock-based compensation expense

	Years ended
	December 31,
	2014		2013		2012
Research and development	$	510	$	267	$	315
Sales and marketing		353		909		1,407
General and administrative		866		1,480		1,777
Stock compensation expense	$	1,729	$	2,656	$	3,499

	Remaining unamortized expense at  December 31, 2014
Stock-based compensation	$	880

Summary of all warrant activity

Outstanding and exercisable	Warrants			Weighted Average Exercise Price		Weighted Average  Remaining Contractual Life
January 1, 2012		5,405,606		$	1.57		2.45
Issued		-			-		-
Expired/forfeited		(232	)		31.75		-
Exercised		(700,738	)		1.18		-
December 31, 2012		4,704,636			1.61		1.41
Issued		-			-		-
Expired/forfeited		-			-		-
Exercised		(3,876,063	)		1.45		-
December 31, 2013		828,573			2.39		2.06
Issued		2,575,000			5.09		-
Expired/forfeited		(40,000	)		3.98		-
Exercised		(28,500	)		2.85		-
Outstanding and exercisable, December 31, 2014		3,335,073		$	4.45		0.93

Employee Stock Option [Member]

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

Summary of all stock option plans / warrant activity

	Weighted  Average  Number of  Shares			Exercise Price  Per Share		Weighted-Average Exercise Price
Outstanding at January 1, 2012		19,324		$	35.39 – 368.75	$	92.19
Granted		1,704,000		$	4.02 – 6.28	$	4.35
Cancelled or expired		(8,124	)	$	35.39 – 368.75	$	69.36
Exercised		--			--	$	--
Outstanding, vested and expected to vest  at December 31, 2012		1,715,200		$	4.02 – 125.00	$	5.04
Granted		145,000		$	5.54 - 7.70	$	6.06
Cancelled or expired		(18,256	)	$	4.25- 125.00	$	5.57
Exercised		(241,361	)	$	4.25 – 6.28	$	4.39
Outstanding, vested and expected to vest  at December 31, 2013		1,600,583		$	4.02 – 122.50	$	5.22
Granted		405,200		$	2.08-8.21	$	6.31
Cancelled or expired		(296,383	)	$	4.65- 122.50	$	5.46
Exercised		--		$	--	$	--
Outstanding, vested and expected to vest  at December 31, 2014		1,709,400		$	2.08 – 86.25	$	4.92

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
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