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Accrued Liabilities (Accrued Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Accrued Liabilities [Abstract]    
Accrued bonus $ 5,082 $ 4,915
Accrued commissions 4,526 4,477
Accrued payroll and employee-related expenses 3,195 2,281
Accrued taxes and value-added taxes payable 725 1,272
Accrued royalties 361 442
Other accrued liabilities 298 399
Sales returns allowance 133 135
Accrued non-employee stock options   120
Total $ 14,320 $ 14,041