Commitments and Contingencies (Details) (USD $)	0 Months Ended	1 Months Ended		12 Months Ended
	Jun. 12, 2013 option facility sqft	Jun. 30, 2013 letters_of_credit	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2014				$ 1,010,000
2015				2,000,000
2016				2,060,000
2017				2,122,000
2018				2,186,000
2019 and thereafter				27,029,000
Total				36,407,000
Operating Leases, Rent Expense				600,000	600,000	800,000
Operating Leases, Number of Facilities	2
Operating Leases, Facility, Area	129,000
Lessee Leasing Arrangements, Operating Leases, Term of Contract	15 years
Lessee Leasing Arrangements, Operating Leases, Number of Renewal Options	1
Lessee Leasing Arrangements, Operating Leases, Renewal Term	5 years
Operating Leases, Rent Expense, Minimum Rentals	1,900,000
Lessee Leasing Arrangements, Operating Leases, Landlord Improvement Allowance	6,800,000
Line of Credit Facility, Number of Letters of Credit		2
Letters of Credit Outstanding, Amount	5,400,000
Cash paid for legal settlement			$ 5,000,000
Operating Leases, Future Minimum Payments Due, Base Rent Increases [Abstract]
2015	3.00%
2016	3.00%
2017	3.00%
2018	3.00%
2019	3.00%
2020 and beyond	4.00%