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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2013

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, 2013

Annual dividend yield			--
Expected life (years)			4.3
Risk-free interest rate			0.65%
Expected volatility			154%

		For the Six
		Months Ended June 30, 2012

Annual dividend yield			--
Expected life (years)			3.8
Risk-free interest rate			0.55% - 0.57%
Expected volatility			186% - 187%

Summary of stock-based compensation expense

		Three months ended June 30,								Six months ended June 30,
		2013				2012				2013				2012
Product research and development		$	58			$	178			$	118			$	187
Sales and marketing		$	194				918				385				943
General and administrative		$	501				1,221				836				1,221
Stock compensation expense		$	753			$	2,317			$	1,339			$	2,351

		Remaining unamortized expense at June 30, 2013
Stock-based compensation		$	2,401

Summary of all warrant activity

		June 30, 2013
Outstanding and exercisable		Warrants				Weighted Average Exercise Price				Weighted Average Remaining Contractual Life
January 1, 2013			4,704,636			$	1.61				1.41
Issued			--				--				--
Expired/forfeited			--				--				--
Exercised			(1,046,211	)			1.35				--
Outstanding and exercisable, June 30, 2013			3,658,425			$	1.69				0.92

Summary of outstanding warrants to purchase common stock

Below is a summary of Outstanding Warrants to Purchase Common Stock as of June 30, 2013:

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
September 2010 Repricing Warrant		9/28/2010		$	1.38		4,000			9/28/2013
October 2010 Repricing Warrants		10/18/2010		$	1.38		1,845,461			10/18/2013
October 2010 Employee Warrants		10/15/2010		$	1.38		800,000			10/15/2013
December 2010 Employee Warrants		12/3/2010		$	1.63		200,000			12/3/2015
January 2011 Employee Warrant		1/21/2011		$	2.00		20,000			1/21/2014
February 2011 Legal Advisor Warrant		2/22/2011		$	2.50		80,000			2/22/2016
March 2011 Investor Warrants		3/9/2011		$	3.13		538,864			3/9/2016
March 2011 Investor Warrants		4/7/2011		$	3.13		34,100			4/7/2016
May 2011 Consultant Warrant		5/17/2011		$	4.05		20,000			5/17/2014
September 2011 Employee Warrant		9/12/2011		$	3.90		20,000			9/12/2014
Total Warrants Outstanding							3,658,425

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, 2013			1,715,200			$	5.04
Granted			15,000				5.97
Cancelled or expired			(18,256	)			6.04
Exercised			(38,456	)			4.33
Outstanding at June 30, 2013			1,673,488			$	5.05