Stock Plans, Share-Based Payments and Warrants (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Option Activity

The following table summarizes the option activity for the years ended December 31, 2015 and 2014:

	Shares			Weighted Average Exercise Price
Outstanding at December 31, 2013	$	2,410,134		$	1.28
Options granted		352,519			0.50
Options forfeited or expired		(290,419	)		2.45
Outstanding at December 31, 2014		2,472,234			0.96
Options granted		2,911,829			0.56
Options forfeited or expired		(1,080,425	)		1.28
Outstanding at December 31, 2015	$	4,303,638		$	0.65

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable

The following table summarizes the options exercisable and vested and expected to vest as of December 31, 2015 and 2014:

	Shares		Weighted Average Exercise Price
Exercisable at December 31, 2014		1,679,392	$	1.11
Vested and expected to vest at December 31, 2014		2,426,249	$	1.04
Exercisable at December 31, 2015		1,377,665	$	0.84
Vested and expected to vest at December 31, 2015		4,133,932	$	0.66

Schedule of Fair Value Assumptions

The fair value of each option grant is estimated on the date of grant using the Black-Scholes option pricing model with the below assumptions for the risk-free interest rates, expected dividend yield, expected lives and expected stock price volatility.

	Option Pricing Assumptions
Grant Year	2015			2014
Stock Price Volatility		121.9	%		129.8	%
Risk-Free Interest Rates		1.60	%		1.86	%
Expected Life (in years)		6.15			5.84
Expected Dividend Yield		0	%		0	%

Summary of Restricted Stock Activity

The following table summarizes restricted stock activity for the year end December 31, 2015 and 2014:

	Shares			Weighted Average Grant Date Fair Value
Nonvested at December 31, 2013		75,450		$	0.66
Granted		132,077			0.86
Vested		(75,450	)		0.66
Nonvested at December 31, 2014		132,077			0.86
Granted		617,795			0.48
Vested		(248,690	)		0.73
Nonvested at December 31, 2015		501,182		$	0.46

Summary of Terms of Outstanding Warrants

The following table summarizes certain terms of all of the Company’s outstanding warrants at December 31, 2015 and 2014:

Total Outstanding Warrants

Title of Warrant	Date Issued	Expiry Date	Exercise Price		Total Common Shares Issuable as December 31,
					2015		2014
Liability-classified warrants
2007 Warrants - Lambda	11/14/2007	3/21/2019	$	0.30		-		11,742,100
						-		11,742,100
Equity-classified warrants
Shareholder Rights Offering Warrants	3/10/2011	3/10/2016	$	0.40		1,565,414		2,228,238
March 2011 Lambda Warrants	3/10/2011	3/21/2019	$	0.40		-		2,782,577
May 2015 – private placement warrants	3/18/2015	3/18/2020	$	0.85		917,149		-
						2,482,563		5,010,815
Total						2,482,563		16,752,915