Net Loss Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Abstract]
Net loss	$ (5,857)	$ (6,603)	$ (29,256)	$ (25,064)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	$ (6,010)	$ (6,603)	$ (28,959)	$ (25,064)
Weighted average shares	61,327	56,961	59,224	56,365
Net loss per share - basic and diluted	$ (0.10)	$ (0.12)	$ (0.49)	$ (0.44)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock options	4,390	653	4,585	1,069
Common stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock options	3,484	13	3,679	429
Restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock options	487	640	487	640
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock options	419	0	419	0