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Accrued Liabilities (Tables)
9 Months Ended
Sep. 30, 2014
Accrued Liabilities, Current [Abstract]  
Schedule of Accrued Liabilities
Accrued liabilities consist of the following (in thousands):
 
September 30,
2014
 
December 31,
2013
Rebates and lease buyouts
$
4,202

 
$
1,699

Advance payments from customers
3,749

 
4,971

Accrued Group Purchasing Organization (GPO) fees(1)
3,314

 
2,324

Technology license purchase obligation, current portion
250

 
1,500

Taxes payable
3,159

 
1,664

Other
2,399

 
1,588

Total
$
17,073

 
$
13,746