Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Stock-Based Compensation [Abstract]

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

Information with respect to stock option and warrant activity as of and for the year ended December 31, 2012 is as follows:

						Weighted
					Aggregate	Average
		Number	Weighted		Intrinsic	Remaining
		of	Average		Value	Contractual Life
		Shares	Exercise Price		(in thousands)	(Years)
Shares under option and warrant, December 31, 2011		3,479,450	$                  3.46
	Options granted	212,870	2.26
	Options exercised	(266,211)	1.63
	Options forfeited	(216,439)	3.73
	Warrants expired	(138,867)	6.00
Shares under option December 31, 2012		3,070,803	3.40		$                   534	4.85
Options expected to vest		1,750,107	2.75		$                   358	5.43
Options exercisable at December 31, 2012		1,320,696	$                  4.27	`	$                   176	4.08

Schedule of Nonvested Share Activity

All outstanding warrants were vested prior to 2012.

		Weighted
	Number	Average
	of Shares	Fair Value
Nonvested options at December 31, 2011	2,040,690	$          1.57
Options granted	212,870	0.93
Options vested during the period	(503,453)	1.76
Nonvested options at December 31, 2012	1,750,107	$          1.43

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The fair value of the options granted in 2012, 2011 and 2010 were estimated on the date of grant using a Black-Scholes option-pricing model with the following assumptions:

	Years ended December 31,
	2012	2011	2010
Risk-free interest rates	.34 - 1.16%	1.06 - 2.28%	.57% - 2.93%
Dividend yield	0%	0%	0%
Expected life	2.00 - 6.28 years	3.75 - 6.98 years	2.5 - 6.5 years
Volatility	52.13 - 57.85%	49.49 - 60.24%	37.2 - 63.8%
Weighted average volatility	53.85%	55.04%	55.38%