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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Accrued Liabilities, Current [Abstract]    
Rebates and lease buyouts $ 4,596 $ 1,699
Advance payments from customers 3,656 4,971
Accrued Group Purchasing Organization (GPO) fees(1) 2,848 [1] 2,324 [1]
Technology license purchase obligation, current portion 500 1,500
Taxes payable 2,719 1,664
Other 1,851 1,588
Total $ 16,170 $ 13,746
[1] Fees paid pursuant to GPO agreements. Customers who buy our products pursuant to a GPO agreement obtain pre-negotiated contract terms and pricing.