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Income taxes (Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets |  |
Reserves | $ 610 | $ 1,152
Net operating loss carryforwards | 85,282 | 83,608
R&D credit carryforwards | 9,047 | 8,593
Depreciation/amortization deferred | 16,978 | 15,884
Other | 5,808 | 6,076
Net deferred taxes before valuation allowance | 117,725 | 115,313
Less: Valuation allowance | (117,725) | (115,313)
Deferred tax assets | $ 0 | $ 0

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