Commitments and Contingencies (Details) (USD $)	9 Months Ended
	Sep. 30, 2011 M D Component Lease
Lease Commitments
Number of operating leases	2
Corporate headquarters
Lease Commitments
Aggregate annual cash payments, low end of range	$ 1,800,000
Aggregate annual cash payments, high end of range	2,500,000
Irrevocable standby letter of credit provided to landlord	785,000
Off-site back-up facility
Lease Commitments
Aggregate annual cash payments, low end of range	26,000
Aggregate annual cash payments, high end of range	$ 30,000