Commitments and Contingencies (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Future minimum lease payments under operating leases
2014	$ 13,072,000
2015	14,152,000
2016	15,255,000
2017	15,778,000
2018	604,000
Total future minimum lease payments	58,861,000
Future minimum lease payments under capital leases
2014	1,434,000
2015	1,265,000
2016	2,157,000
Total future minimum lease payments	4,856,000
Less amounts representing interest	(583,000)
Capital lease obligations at the end of the period	4,273,000
Less current portion of capital lease obligations	1,139,000	261,000
Capital lease obligations, net of current portion	3,134,000	308,000
Continuing operations
Operating lease
Rent expense	$ 8,800,000	$ 7,200,000	$ 6,600,000