15.STOCK OPTIONS

Stock options

The Company has approved stock option plans for the granting of stock options to employees, Directors, and consultants. Options for the purchase of 3,649,508 shares of Common Stock have been issued under the 2008 Stock Option Plan, which, pursuant to a 2014 amendment, authorizes a total of 6,000,000 shares of Common Stock upon the exercise of stock options. Options for the purchase of 1,875,419 shares under the 2008 Stock Option Plan were outstanding as of December 31, 2016 2,350,492 shares are available for future issuance under the 2008 Stock Option Plan. A stock option for 3,000,000 shares granted to Thomas J. Shaw on November 2, 2016 terminated by its terms prior to becoming exercisable following a December 27, 2016 shareholder vote against such option.

The Compensation and Benefits Committee administers all plans and determines and/or recommends to the Board exercise prices at which options are granted. All executive compensation, including the granting of stock options, is determined by the Compensation and Benefits Committee. Shares issued upon exercise of options come from the Company’s authorized but unissued Common Stock. The options vested over periods up to three years from the date of grant and generally expire ten years after the date of grant. Unvested options issued under the 2008 Stock Option Plan expire immediately after termination of employment.

Employee options

A summary of Director, officer, and employee options granted and outstanding under the Plans is presented below:

	Years Ended December 31,
	2016					2015					2014
	Shares		Weighted Average Exercise Price			Shares		Weighted Average Exercise Price			Shares		Weighted Average Exercise Price
Outstanding at beginning of period	2,125,069		$	0.94		2,386,736		$	0.95		2,820,631		$	0.95
Granted	750,400		$	2.18		—		$	—		—		$	—
Exercised	(1,046,580	)	$	(0.82	)	(259,977	)	$	(1.05	)	(418,195	)	$	(0.95	)
Forfeited	(10,970	)	$	(1.08	)	(1,690	)	$	(1.30	)	(15,700	)	$	(1.37	)


Outstanding at end of period	1,817,919		$	1.52		2,125,069		$	0.94		2,386,736		$	0.95


Exercisable at end of period	1,218,519		$	1.06		2,125,069		$	0.94		2,386,736		$	0.95

600,400 employee options were issued in 2016. A grant of three million options to the Company’s chief executive officer terminated by its terms prior to becoming exercisable. The fair value of the September 2016 grants exercisable into 500,400 shares is $1.783 per share of underlying Common Stock and is estimated on the date of the grant using the Black Scholes pricing model with the following assumptions: expected volatility of 67.1%, risk free interest rate of 1.51%, and an expected life of 7.1 years. These options were issued under the First Amended 2008 Stock Option Plan. The fair value of the December 2016 grants exercisable into 100,000 shares is $0.728 per share of underlying Common Stock and is estimated on the date of the grant using the Black Scholes pricing model with the following assumptions: expected volatility of 72.5%, risk free interest rate of 2.37%, and an expected life of 7.1 years. These options were issued under the First Amended 2008 Stock Option Plan. No employee options were issued in 2015 or 2014.

150,000 options were issued to non-employee directors in 2016. The fair value of the 2016 grants is $0.728 per share of underlying Common Stock and is estimated on the date of the grant using the Black Scholes pricing model with the following assumptions: expected volatility of 72.5%, risk free interest rate of 2.37%, and an expected life of 7.1 years. These options were issued under the First Amended 2008 Stock Option Plan. No options were issued to non-employee directors in 2015 or 2014.

The following table summarizes information about Director, officer, and employee options outstanding under the aforementioned plans at December 31, 2016:

Exercise Prices	Shares Outstanding	Weighted Average Remaining Contractual Life	Shares Exercisable
1.30	478,416	1.88	478,416
1.46	50,000	6.37	50,000
0.81	540,103	2.54	540,103
1.05	250,000	9.99	150,000
2.75	499,400	9.70	—

Non-employee options

A summary of options outstanding during the years ended December 31 and held by non-employees is as follows:

	Years Ended December 31,
	2016			2015					2014
	Shares	Weighted Average Exercise Price		Shares		Weighted Average Exercise Price			Shares	Weighted Average Exercise Price

Outstanding at beginning of period	57,500	$	0.81	70,000		$	0.81		70,000	$	0.81
Granted	—	—		—		—			—	—
Exercised	—	—		(12,500	)	(0.81		)	—	—
Forfeited	—	$	—	—		—			—	$	—


Outstanding at end of period	57,500	$	0.81	57,500		$	0.81		70,000	$	0.81


Exercisable at end of period	57,500	$	0.81	57,500		$	0.81		70,000	$	0.81

The following table summarizes information about non-employee options outstanding under the aforementioned plans at December 31, 2016:

Exercise Price		Shares Outstanding		Weighted Average Remaining Contractual Life		Shares Exercisable
0.81		57,500		2.54		57,500

The Company recorded $388 thousand of stock-based compensation expense in 2016. Unrecognized stock-based compensation expense of $684,794 will be fully recognized in 2017. The Company recorded no stock-based compensation expense in 2015 or 2014. The total intrinsic value of options exercised was $1,414,892; $856,269; and $1,157,615 in 2016, 2015, and 2014, respectively. The aggregate intrinsic value of options outstanding and exercisable with exercise prices lower than market price at December 31, 2016, was $71,712.

Options Pricing Models — Assumptions

The expected life is based on the Company’s historical experience with option exercise trends. The assumptions for expected volatility is based on a calculation of volatility over the five-years preceding the grant date. Risk-free interest rates are set using grant-date U.S. Treasury yield curves. In its calculations, the Company assumed no dividends.