Restructuring (Details) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended	25 Months Ended	3 Months Ended	18 Months Ended	9 Months Ended				25 Months Ended	12 Months Ended	9 Months Ended	34 Months Ended	18 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jul. 31, 2012 2008 Plan	Dec. 31, 2010 2008 Plan employee	Jun. 30, 2010 2010 Plan employee	Sep. 30, 2011 2010 Plan employee	Sep. 30, 2012 2012 Plan	Sep. 30, 2012 Contract Termination and Other Associated Costs 2008 Plan	Sep. 30, 2012 Contract Termination and Other Associated Costs 2010 Plan	Sep. 30, 2012 Contract Termination and Other Associated Costs 2012 Plan	Dec. 31, 2010 Severance and Related Costs 2008 Plan	Dec. 31, 2010 Severance and Related Costs 2010 Plan	Sep. 30, 2012 Severance and Related Costs 2012 Plan	Sep. 30, 2011 Contract Termination [Member] 2008 Plan	Sep. 30, 2011 Contract Termination [Member] 2010 Plan	Sep. 30, 2012 Contract Termination [Member] 2012 Plan
Restructuring Cost and Reserve [Line Items]
Positions terminated						70		25
Severance-related costs													$ 1,500,000	$ 400,000	$ 400,000
Contract termination costs																3,600,000	300,000	400,000
Abatement of rent and other operating expenses					200,000
Percentage reduction in workforce							10.00%
Number of positions intended to terminate							26
Contractual commitments expected to remain obligations through December 2013									200,000
Restructuring Reserve [Roll Forward]
Accrued restructuring balance, beginning of period									0	1,212,000	116,000	0			0
Restructuring plan expense	(183,000)	659,000	(228,000)	655,000					772,000	36,000	4,000	332,000			440,000
Adjustments to restructuring plan									150,000	(247,000)	(21,000)	150,000			0
Cash payments									(772,000)	(637,000)	(64,000)	(332,000)			(440,000)
Accrued restructuring balance, end of period									$ 150,000	$ 364,000	$ 35,000	$ 150,000			$ 0