Common Stock (Assumptions) (Details)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate, min	0.94%		0.55%
Risk-free interest rate, max	1.825%		2.275%
Expected volatility of common stock, min	67.70%		61.40%
Expected volatility rate, max	70.30%		69.30%
Dividend yield	0.00%		0.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of options in years	3 years 6 months	[1]	3 years 4 months 2 days	[1]
Vesting period in years	3 years 6 months		3 years 4 months 24 days
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of options in years	4 years		6 years 3 months
Vesting period in years	4 years		6 years 3 months 18 days

[1] Grants were made to an optionee for whom the Company was able to reasonably estimate the expected life of the award.