Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2015

A summary of the status of our stock options as of June 30, 2015, and changes during the six-month period then ended, is presented below:



	Six Months Ended June 30, 2015
	Number of Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value
Outstanding at beginning of period	5,345,764		$	2.16
Granted	1,365,400		1.67
Exercised	(141,250	)	0.57
Canceled and Forfeited	(99,900	)	2.29
Expired	(5,750	)	1.26
Outstanding at end of period	6,464,264		$	2.09	7.6 years	$	774,822

Exercisable at end of period	3,169,487		$	2.42	6.2 years	$	409,459

A summary of the status of our unvested restricted stock as of June 30, 2015, and changes during the six-month period then ended, is presented below:



	Six Months Ended June 30, 2015
	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested at beginning of period	498,250		$	1.91
Granted	332,000		1.73
Vested	(240,750	)	1.85
Forfeited	(38,750	)	3.15
Unvested at end of period	550,750		$	1.74