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Income Taxes - Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Deferred tax assets:    
Net operating losses—Foreign $ 13,009 $ 10,163
Net operating losses—U.S.  34,856 32,328
Accrued vacation and bonus 674 437
Inventory capitalization 226 238
Allowance for doubtful accounts 87 47
Stock compensation expense 1,989 3,455
Restructuring costs 42 353
Depreciation 485 0
Other 953 1,158
Total deferred tax assets before valuation allowance 52,321 48,179
Less: valuation allowance (41,909) (39,337)
Net deferred tax assets 10,412 8,842
Deferred tax liabilities:    
Amortization of intangibles 408 204
Amortization of goodwill 6,374 5,949
Depreciation 0 37
Capitalized costs 3,730 2,542
Pension liability 482 556
Total deferred tax liabilities 10,994 9,288
Net deferred taxes $ (582) $ (446)