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Income taxes - Schedule of Components of Net Deferred Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Compensation $ 928 $ 1,056
Inventories and receivables 3,008 2,965
Accrued expenses 424 663
Stock compensation 5,175 3,497
Net operating losses 43 210
Other 898 925
Deferred tax assets 10,476 9,316
Deferred tax liabilities:    
Goodwill 2,618 2,214
Fixed assets 2,405 1,923
Intangible assets 24,591 25,962
Other 1,023 313
Deferred tax liabilities 30,637 30,412
Net deferred tax liabilities $ 20,161 $ 21,096