Stock-Based Compensation Arrangements (Tables)

6 Months Ended

Jun. 30, 2016

Stock-Based Compensation Arrangements [Abstract]

Total Compensation Cost Recorded for Stock-Based Compensation

Total stock-based compensation is as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Stock option grants beginning of period	$	214,647	$	141,383	$	424,987	$	239,823
Stock-based arrangements during the period:
Stock option grants		-		110,323		3,367		157,371
Restricted stock issued:
Employee stock purchase plan		611		1,219		1,174		2,041
	$	215,258	$	252,925	$	429,528	$	399,235

Schedule of Stock option activity

The following table details stock option activity:

	Six Months Ended June 30, 2016				Six Months Ended June 30, 2015
	Shares		Weighted Avg Exercise Price		Shares		Weighted Avg Exercise Price
Outstanding, beginning of period		21,657,776	$	0.21		4,523,900	$	0.39
Stock options granted		1,185,400		0.05		17,779,027		0.17
Stock options exercised		—		0.00		—		0.00
Restricted stock exercised		—		0.00		—		0.00
Canceled/Expired		(780,406)		0.33		(14,060)		0.28
Outstanding, end of period		22,062,770	$	0.20		22,288,867	$	0.28
Exercisable, end of period		8,211,111	$	0.25		2,609,643	$	0.36