Commitments (Details) (USD $)	0 Months Ended				1 Months Ended	12 Months Ended			0 Months Ended
	Feb. 14, 2012 amendement	Dec. 03, 2010 amendement	Nov. 12, 2009 amendement	Dec. 16, 2008 amendement	Nov. 30, 2006	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 14, 2012 Corporate Headquarters lease, 4th amendment terms option	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 (in months)					30 months				12 months	60 months
Number of amendments	4	3	2	1
Base monthly rent (in dollars per square foot)									2.50	2.75
Area of property (in square feet)										4,914	45,240
Base monthly rent									$ 45,015	$ 13,513
Number of options to extend lease term									1
Extended period of lease (in years)									1 year	1 year
Lease initial term											84 months
Period after which lease commences following the delivery of premises											4 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
Future minimum lease payments under operating leases
2013						1,639,000
2014						1,481,000
2015						1,999,000
2016						2,049,000
2017						1,899,000
Thereafter						4,458,000
Total						13,525,000
Rent expenses under operating lease
Rent expense						$ 912,000	$ 671,000	$ 676,000