Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 lease	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies
Number of non-cancelable and renewable operating leases	3
Operating leases
2015	$ 2,226,000
2016	1,995,000
2017	25,000
Total minimum payments	4,246,000
Rent expense under operating leases	2,300,000	2,200,000	2,200,000
Capital leases
2015	44,000
2016	44,000
Total minimum payments	88,000
Less: amount representing interest	(3,000)
Present value of minimum payments	85,000
Less current portions of obligations	(42,000)	(42,000)
Long term obligation	$ 43,000	$ 85,000