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Income Tax - Deferred tax assets and deferred tax liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Components Of Deferred Tax Assets And Liabilities [Abstract]    
Accounts receivable $ 57 $ 93
Inventory 1,147 891
Operating loss and credit carryforwards 20,095 8,287
Accrued expenses 1,692 0
Pension liabilities 110 151
Contingent consideration 0 2,273
Stock compensation expense 999 1,667
Other assets 172 122
Total gross deferred assets 24,272 13,484
Less: valuation allowance (13,899) (11,447)
Deferred tax assets 10,373 2,037
Deferred tax liabilities:    
Indefinite-lived intangible assets 1,975 3,166
Definite-lived intangible assets 10,221 2,383
Property, plant and equipment 204 0
Other accrued liabilities 63 270
Total Deferred Tax Liabilities 12,463 5,819
Total Deferred Tax Liabilities $ (2,090) $ (3,782)