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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of accrued liabilities    
Salary and payroll tax accrual $ 9,962 $ 9,449
Taxes payable 3,238 2,655
License fee obligation 1,000 1,000
Placement fees payable 2,438 4,000
Accrued other 5,879 7,850
Total accrued liabilities $ 22,517 $ 24,954