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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

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

	Year Ended				Year Ended
	December 31, 2017				December 31, 2016
			Wtd. Avg.				Wtd. Avg.
			Exercise				Exercise
	Shares		Price		Shares		Price
Outstanding at beginning of year		2,513,861	$	1.78		2,555,263	$	1.80
Granted		155,000		2.93		739,000		1.80
Exercised		(131,427)		1.17		(103,308)		1.22
Forfeited		(52,932)		3.45		(469,856)		2.15
Expired - vested		(94,490)		1.78		(207,238)		1.50
Outstanding at end of year		2,390,012	$	1.85		2,513,861	$	1.78

Stock options exercisable at year end		1,583,585	$	1.72		1,329,392	$	1.66

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range

The following table summarizes information about service vesting-based stock options outstanding at December 31, 2017:

Range of Exercise Prices		Number Outstanding at December 31, 2017		Weighted Average Remaining Contractual Life		Weighted Average Exercise Price
$	0.49-$1.00		17,855		1.17	$	0.60
$	1.01-$1.50		645,108		2.75	$	1.23
$	1.51-$2.50		1,632,408		7.56	$	1.93
$	2.51-$8.60		94,641		7.89	$	4.94
			2,390,012		6.22	$	1.85

Weighted average assumptions of share based payment

The following is a summary of unvested restricted stock activity for 2017 and 2016, and the status of unvested restricted stock outstanding at December 31, 2017 and 2016:

	Year Ended				Year Ended
	December 31, 2017				December 31, 2016
			Wtd. Avg.				Wtd. Avg.
			Grant Date				Grant Date
	Shares		Fair Value		Shares		Fair Value
Outstanding at beginning of year		98,439	$	1.90		––	$	––
Granted		207,350		1.76		200,000		1.90
Vested		(51,563)		1.90		(84,894)		1.90
Forfeited		(16,300)		1.76		(16,667)		1.90
Non-vested at end of year		237,926	$	1.79		98,439	$	1.90

Stock compensation expense

We recorded total stock compensation expense for the years ended December 31, 2017 and 2016, as follows:

	Year Ended December 31,
	2017		2016
Research and development costs	$	236,972	$	151,849
Sales and marketing costs		230,461		176,878
General and administrative costs		638,346		426,035
Cost of product sales		164,424		2,794
Joint venture restructuring charges		––		19,438
Total	$	1,270,203	$	776,994