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

12 Months Ended

Dec. 31, 2017

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, 2017 and 2016:

	Shares			Weighted Average Exercise Price
Outstanding at December 31, 2015		4,303,638		$	0.65
Options granted		510,520			0.37
Options forfeited or expired		(221,811	)		1.04
Outstanding at December 31, 2016		4,592,347			0.60
Options granted		2,311,542			0.44
Options forfeited or expired		(133,112	)		0.77
Outstanding at December 31, 2017		6,770,777		$	0.55

Summary of Options Exercisable Vested and Expected to Vest

The following table summarizes the options exercisable and vested and expected to vest as of December 31, 2017 and 2016:

	Shares		Weighted Average Exercise Price
Exercisable at December 31, 2016		1,866,019	$	0.70
Vested and expected to vest at December 31, 2016		4,434,220	$	0.61
Exercisable at December 31, 2017		2,271,527	$	0.65
Vested and expected to vest at December 31, 2017		6,509,821	$	0.55

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	2017			2016
Stock Price Volatility		104.56	%		114.63	%
Risk-Free Interest Rates		2.19	%		1.81	%
Expected Life (in years)		6.11			5.83
Expected Dividend Yield		0	%		0	%

Summary of Restricted Stock Activity

The following table summarizes restricted stock activity for the year end December 31, 2017 and 2016:

	Shares			Weighted Average Grant Date Fair Value
Nonvested at December 31, 2015		501,182		$	0.46
Granted		1,047,109			0.35
Vested		(590,955	)		0.46
Nonvested at December 31, 2016		957,336			0.35
Granted		817,144			0.50
Vested		(975,093	)		0.35
Nonvested at December 31, 2017		799,387		$	0.50

Summary of Terms of Outstanding Warrants

The following table summarizes certain terms of all of the Company’s outstanding warrants at December 31, 2017 and 2016:

Total Outstanding Warrants

			Exercise		Total Common Shares Issuable as of December 31,
Title of Warrant	Date Issued	Expiry Date	Price		2017		2016
Equity-classified warrants
May 2015 – private placement warrants	3/18/2015	3/18/2020	$	0.85		917,149		917,149
June 2016 – Note and Warrant Agreement	6/7/2016	6/7/2021	$	0.30		2,374,000		2,374,000
March 2017 – private placement warrants	3/22/2017	3/22/2022	$	0.30		3,807,861		-
Total						7,099,010		3,291,149