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Income taxes (Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets |  |
Reserves | $ 647 | $ 610
Net operating loss carryforwards | 83,289 | 85,282
R&D credit carryforwards | 8,836 | 9,047
Depreciation/amortization deferred | 15,862 | 16,978
Other | 5,773 | 5,808
Net deferred taxes before valuation allowance | 114,407 | 117,725
Less: Valuation allowance | (114,407) | (117,725)
Deferred tax assets | $ 0 | $ 0

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