Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

A summary of the status of our stock options as of December 31, 2014, and changes during the year then ended, is presented below:



	Year Ended December 31, 2014
	Number of Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value
Outstanding at beginning of year	4,866,602		$	2.38
Granted	2,534,605		1.56
Exercised	(468,000	)	0.48
Canceled and forfeited	(1,467,443	)	2.53
Expired	(120,000	)	0.53
Outstanding at end of year	5,345,764		$	2.16	7.8 years	$	1,502,921

Exercisable at end of year	1,960,554		$	2.23	6.1 years	$	713,078

A summary of the status of our unvested restricted stock as of December 31, 2014, and changes during the year then ended, is presented below:



	Year Ended December 31, 2014
	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested at beginning of year	634,250		$	2.73
Granted	380,250		1.48
Vested	(216,250	)	3.08
Forfeited	(300,000	)	2.26
Expired	—		—
Unvested at end of year	498,250		$	1.91