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Income taxes (Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets |  |
Reserves | $ 1,152 | $ 1,561
Net operating loss carryforwards | 83,608 | 82,210
R&D credit carryforwards | 8,593 | 7,435
Depreciation/amortization deferred | 15,884 | 13,005
Other | 6,076 | 5,944
Net deferred taxes before valuation allowance | 115,313 | 110,155
Less: Valuation allowance | (115,313) | (110,155)
Deferred tax assets | $ 0 | $ 0

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