Commitments (Details) (USD $)	0 Months Ended	1 Months Ended	12 Months Ended				0 Months Ended
	Feb. 14, 2012 item	Nov. 30, 2006	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Facilities-related costs	Feb. 14, 2012 Expansion premises space for corporate headquarters sqft	Dec. 11, 2012 Evelyn lease item sqft	Dec. 11, 2012 Evelyn lease Minimum	Dec. 11, 2012 Evelyn lease Maximum
Lease Commitments
Period of lease		30 months					60 months
Number of amendments	4
Base monthly rent (in dollars per square foot)							2.75
Base monthly rent							$ 13,513
Area of property (in square feet)							4,914	45,240
Extended period of lease							1 year
Lease initial term								84 months
Annual rental rate (in dollars per square foot)								31.20
Abatement period of monthly installments of rent									7 months	12 months
Number of options available for lease renewal								1
Operating lease, renewal term								3 years
Number of rights to accelerate termination date								1
Operating leases accelerated termination period								60 months
Number of monthly installments of rent and proportionate share of expenses and taxes payable to landlord on exercising acceleration termination date								6
Lease year till which rent and proportionate share of expenses and taxes payable to landlord								5
Cost of initial alterations rent (in dollars per square foot)								7.00
Lease expiration date						May 31, 2020
Restructuring accruals			7,531,000			1,022,000
Future minimum lease payments under operating leases
2014			1,550,000
2015			2,013,000
2016			2,063,000
2017			1,917,000
2018			1,899,000
Thereafter			2,602,000
Total			12,044,000			3,600,000
Rent expenses under operating lease
Rent expense			$ 2,867,000	$ 912,000	$ 671,000