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Stock-Based Compensation Arrangements (Tables)
 3 Months Ended
Mar. 31, 2015
Stock-Based Compensation Arrangements [Abstract]  
Total Compensation Cost Recorded for Stock-Based Compensation
Total stock-based compensation is as follows:
 
 
 
Three Months Ended March 31,
 
 
 
2015
 
2014
 
Stock option grants beginning of period
 
$
98,440
 
$
119,533
 
Stock-based arrangements during the period:
 
 
 
 
 
 
 
Stock option grants
 
 
47,048
 
 
1,039
 
Restricted stock issued:
 
 
 
 
 
 
 
Employee stock purchase plan
 
 
822
 
 
1,648
 
 
 
$
146,310
 
$
122,220
 
Common Stock Weighted Average Purchase Price
The following table details stock option activity:
 
 
 
Three Months
 
 
 
Ended March 31, 2015
 
 
 
 
 
 
Weighted Average
 
 
 
Shares
 
Exercise Price
 
Outstanding, beginning of period
 
 
4,523,900
 
$
0.39
 
Stock options granted
 
 
3,529,000
 
 
0.26
 
Outstanding, end of period
 
 
8,052,900
 
$
0.33
 
Exercisable, end of period
 
 
2,124,148
 
$
0.39