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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

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 12/31/13			Weighted Average Remaining Contractual Life (years)		Weighted Average Exercise Price			Number Exercisable at 12/31/13		Weighted Average Exercise Price

$ $4.02 - $ 4.25			1,241,000		5.3		$	4.24		1,097,694		$	4.25
$ 4.26 - $ 7.70			348,583		6.1		$	5.43		114,526		$	5.25
$ 7.71 - $ 122.50			11,000		0.7		$	108.45		11,000		$	108.45
			1,600,583		5.4		$	5.22		1,223,220		$	5.28

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

		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,
		2013				2012				2011
Research and development		$	267			$	315			$	11
Sales and marketing			909				1,407				99
General and administrative			1,480				1,777				440
Stock compensation expense		$	2,656			$	3,499			$	550

		Remaining unamortized expense at December 31, 2013
Stock-based compensation		$	1,751

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				-
Outstanding and exercisable, December 31, 2013			828,573			$	2.39				2.06

Stock Options [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, 2011			19,804			$	35.39 – 687.50			$	101.36

Granted			—			$	—			$	—

Cancelled or expired			(480	)		$	135.00 – 687.50			$	523.23
Exercised			—			$	—			$	—
Outstanding at December 31, 2011			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

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
January 2011 Employee Warrant		1/21/2011		$	2.00		7,000			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		371,473			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							828,573