Borrowings (Details 3) (USD $)	12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011 Master Loan and Security Agreement (Term Loan Agreement) Y	Jun. 02, 2011 Master Loan and Security Agreement (Term Loan Agreement)	Sep. 30, 2011 Master Lease Agreement	Dec. 31, 2011 Master Lease Agreement M
Term Loan
Term debt			$ 25,500,000
Term of Term Loan Agreement (in years)		4
Master Lease Agreement
Master lease facility, amount					5,000,000
Term of capital lease (in months)					48
Ending purchase price of underlying equipment					1
Rate of additional interest in event of default (as a percent)		3.00%
Monthly Installments		530,600			54,000
Interest, margin over base rate (as a percent)		3.00%
Remaining scheduled principal repayments
2012		5,837,000
2013		6,367,000
2014		6,367,000
2015		3,184,000
Term loan	21,755,000	21,755,000
Draw on lease facility				2,600,000
Fair value of assets acquired				2,400,000
Principal amount outstanding				2,400,000
Interest, base rate	three-month LIBOR rate for dollar deposits	one month London Interbank Offered Rate (LIBOR)			one month LIBOR rate for dollar deposits
Interest, margin over base rate (as a percent)					3.00%
Deferred gain				200,000
The reductions to the remaining principal balance applying the interest method to the estimated minimum lease payments
2012					590,000
2013					606,000
2014					622,000
2015					424,000
Capital lease, amount					$ 2,242,000