Borrowings (Details 3) (USD $)			12 Months Ended		0 Months Ended	12 Months Ended			1 Months Ended		1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Master Loan and Security Agreement (Term Loan Agreement)	Jun. 02, 2011 Master Loan and Security Agreement (Term Loan Agreement)	Jul. 29, 2013 Master Lease Agreement	Dec. 31, 2013 Master Lease Agreement	Dec. 31, 2012 Master Lease Agreement	Aug. 10, 2012 Master Lease Agreement	Sep. 30, 2011 Master Lease Agreement September 2011 drawn	Dec. 31, 2013 Master Lease Agreement September 2011 drawn	Jun. 30, 2012 Master Lease Agreement June 2012 drawn	Dec. 31, 2013 Master Lease Agreement June 2012 drawn
Term Loan
Term debt				$ 25,500,000
Term of Term Loan Agreement			4 years
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%
Interest, base rate			one month LIBOR rate for dollar deposits			30-day LIBOR						one month LIBOR rate for dollar deposits
Remaining scheduled principal repayments
2014			6,367,000
2015			2,653,000
Term loan	9,020,000	15,388,000	9,020,000
Master Lease Agreement
Master lease facility, amount						5,000,000		25,000,000
Amount borrowed under Credit Agreement						20,600,000	600,000		2,600,000		1,900,000
Interest, margin over base rate (as a percent)			3.00%			2.25%						3.00%
Obligations under capital leases	21,312,000	3,884,000			21,200,000
Interest, fixed rate (as a percent)					3.39%
Term of capital lease					48 months	48 months
Ending purchase price of underlying assets					1			1
Fair value of assets acquired									2,400,000		1,900,000
Principal amount outstanding									2,400,000			1,900,000
Deferred gain									200,000
Amount outstanding under Credit Agreement						19,100,000
The reductions to the remaining principal balance applying the interest method to the estimated minimum lease payments
2014						5,098,000				1,086,000
2015						5,274,000				893,000
2016						5,455,000				237,000
2017						3,269,000
Capital lease, amount						$ 19,096,000				$ 2,216,000