Commitments and Contingencies (Details 2) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 27, 2013	Sep. 30, 2013 Letter of Credit	Dec. 31, 2012 Letter of Credit	Jun. 30, 2013 Letter of Credit Expired and Retained by Landlord
Leases
Remaining contractual obligation for base rent related to lease terminated					$ 61,000,000
Termination obligation under the Surrender Agreement					19,500,000
Termination obligation payable in cash under the Surrender Agreement					15,600,000
Deposit retained by landlord related to lease terminated					3,900,000
Lease restructuring charge	3,200,000
Lease restructuring charge related to the First Premises	1,400,000
Lease restructuring charge related to the Second Premises surrendered	1,800,000
Reserve for lease commitments for Second Premises	0		0
Future Minimum Lease Payments
2013 (Remaining)	565,000		565,000
2014	1,505,000		1,505,000
2015	730,000		730,000
Total	2,800,000		2,800,000
Sublease Rental Income
2013 (Remaining)	349,000		349,000
2014	974,000		974,000
2015	530,000		530,000
Total	1,853,000		1,853,000
Net Lease Payments
2013 (Remaining)	216,000		216,000
2014	531,000		531,000
2015	200,000		200,000
Total	947,000		947,000
Rental expense, net of sublease rental income	100,000	200,000	400,000	600,000
Letters of Credit
Letters of Credit						1,000,000	4,900,000
Letters of Credit								$ 3,900,000