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Accrued Liabilities
6 Months Ended
Jun. 30, 2014
Accrued Liabilities, Current [Abstract]  
Accrued Liabilities
Accrued Liabilities
 
Accrued liabilities consist of the following (in thousands):
 
June 30,
2014
 
December 31,
2013
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

 
2,324

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.