Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2012

Stockholders' Equity [Abstract]

Summary of stock option activity

Stock option activity for the years ended December 31, 2012, 2011 and 2010 is as follows:

	Number of Shares			Weighted Average Exercise  Price Per Share		Aggregate Intrinsic Value
Outstanding at January 1, 2010		3,662,133		$	3.78
Granted in 2010:
Officers and Directors		399,661		$	2.68
Others		382,476			3.22
Exercised		(31,733	)		3.08
Forfeitures		(100,998	)		3.10
Outstanding at December 31, 2010		4,311,539		$	3.65	$	2,671,309
Granted in 2011:
Officers and Directors		209,619		$	3.44
Others		238,918			3.41
Exercised		(129,888	)		2.69
Forfeitures		(76,937	)		3.09
Outstanding at December 31, 2011		4,553,251		$	3.66	$	—
Granted in 2012:
Officers and Directors		281,174		$	2.36
Others		485,540			2.80
Exercised		(789,305	)		2.60
Forfeitures		(250,741	)		3.26
Outstanding at December 31, 2012		4,279,919		$	3.70	$	4,572,205

Summary of stock options outstanding

Options outstanding at December 31, 2012 are as follows:

Range of Exercise Prices	Number Outstanding		Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price		Aggregate Intrinsic Value
$ 1.00 – 5.00		3,373,419		6.15	$	3.00
$ 5.01 – 10.00		906,500		4.66	$	6.30
		4,279,919					$	4,572,205

Summary of stock options exercisable

Options exercisable at December 31, 2012 are as follows:

Range of Exercise Prices	Number Outstanding		Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price		Aggregate Intrinsic Value
$ 1.00 – 5.00		2,518,779		5.29	$	3.03
$ 5.01 – 10.00		906,500		4.66	$	6.30
		3,425,279					$	3,323,902

Summary of non-vested stock options

Nonvested stock options as of December 31, 2012, and changes during the year then ended, are as follows:

Nonvested Shares	Shares			Weighted Average Grant Date Fair Value		Intrinsic Value
Nonvested at January 1, 2012		786,188
Granted		766,714
Vested		(627,528	)
Forfeited		(70,734	)
Nonvested at December 31, 2012		854,640		$	2.91	$	1,248,303

Summary of warrants outstanding to purchase Common Stock

Warrants outstanding and exercisable at December 31, 2012 are as follows:

Range of Exercise Prices	Number Outstanding		Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price		Aggregate Intrinsic Value
$0.00 – 5.00		2,009,436		1.89	$	3.88	$	1,428,672