Borrowings (Details 3) (USD $)	12 Months Ended		12 Months Ended		12 Months Ended		1 Months Ended		1 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2012 Master Loan and Security Agreement (Term Loan Agreement)	Jun. 02, 2011 Master Loan and Security Agreement (Term Loan Agreement)	Dec. 31, 2012 Master Lease Agreement	Aug. 10, 2012 Master Lease Agreement	Sep. 30, 2011 Master Lease Agreement September 2011 drawn	Dec. 31, 2012 Master Lease Agreement September 2011 drawn	Jun. 30, 2012 Master Lease Agreement June 2012 drawn	Dec. 31, 2012 Master Lease Agreement June 2012 drawn
Term Loan
Term debt				$ 25,500,000
Term of Term Loan Agreement			4 years
Master Lease Agreement
Master lease facility, amount					5,000,000	25,000,000
Master lease facility, amount available for funding leasehold improvements						14,000,000
Maximum period of expenditures reimbursed made during interim funding period					90 days
Term of capital lease	48 months				48 months
Variable rate basis on captial lease obligation					4-year LIBOR
Ending purchase price of underlying equipment					1	1
Rate of additional interest in event of default (as a percent)			3.00%
Monthly Installments			530,600
Interest, margin over base rate (as a percent)					2.25%
Remaining scheduled principal repayments
2013			5,837,000
2014			6,367,000
2015			3,184,000
Term loan		15,388,000	15,388,000
Draw on lease facility							2,600,000		1,900,000
Fair value of assets acquired							2,400,000		1,900,000
Principal amount outstanding							2,400,000			1,900,000
Interest, base rate			one month LIBOR rate for dollar deposits		30-day LIBOR					one month LIBOR rate for dollar deposits
Interest, margin over base rate (as a percent)			3.00%		2.25%					3.00%
Deferred gain							200,000
The reductions to the remaining principal balance applying the interest method to the estimated minimum lease payments
2013								1,064,000
2014								1,086,000
2015								893,000
2016								237,000
Capital lease, amount								3,280,000
Amount outstanding under Credit Agreement					$ 600,000