Property, Equipment and Building Improvements (Details) (USD $)	0 Months Ended		9 Months Ended
	Aug. 29, 2012	Mar. 14, 2008	Sep. 30, 2013 item	Dec. 31, 2012
Plant and Equipment disclosures
Lease agreement term		7 years 6 months
Lease expiration period from the commencement date	15 years
Total lease payment			$ 40,000,000
Number of lease renewal options			2
Property, equipment and building improvements, gross			28,250,000	22,635,000
Less: accumulated depreciation and amortization			14,193,000	11,787,000
Property, equipment and building improvements, net			14,057,000	10,848,000
Maximum
Plant and Equipment disclosures
Lease, renewal option			10 years
Lease Renewal Term One | Minimum
Plant and Equipment disclosures
Lease, renewal option			3 years
Lease Renewal Term One | Maximum
Plant and Equipment disclosures
Lease, renewal option			7 years
Lease Renewal Term Two | Maximum
Plant and Equipment disclosures
Lease, renewal option			10 years
Land
Plant and Equipment disclosures
Property, equipment and building improvements, gross			156,000	156,000
Building
Plant and Equipment disclosures
Property, plant and equipment, useful life			30 years
Property, equipment and building improvements, gross			3,039,000	3,039,000
Construction in progress, lease
Plant and Equipment disclosures
Property, plant and equipment, useful life			30 years
Amount of construction-in-progress recorded during period			4,200,000
Property, equipment and building improvements, gross			4,164,000
Computers and equipment
Plant and Equipment disclosures
Property, equipment and building improvements, gross			14,551,000	13,387,000
Computers and equipment | Minimum
Plant and Equipment disclosures
Property, plant and equipment, useful life			3 years
Computers and equipment | Maximum
Plant and Equipment disclosures
Property, plant and equipment, useful life			5 years
Leasehold improvements
Plant and Equipment disclosures
Property, equipment and building improvements, gross			$ 6,340,000	$ 6,053,000
Building improvements | Maximum
Plant and Equipment disclosures
Property, plant and equipment, useful life			15 years