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Income taxes (Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets |  |
Reserves | $ 1,561 | $ 2,351
Net operating loss carryforwards | 82,210 | 126,335
R&D credit carryforwards | 7,435 | 6,998
Depreciation/amortization deferred | 13,005 | 20,024
Deferred revenue | 1,081 | 2,091
Other | 5,944 | 9,045
Net deferred taxes before valuation allowance | 111,236 | 166,844
Less: Valuation allowance | (111,236) | (166,844)
Deferred tax assets | $ 0 | $ 0

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