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Income taxes (Deferred Tax Assets) (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Deferred tax assets, current |  |
Reserves | $ 2,994,000 | $ 3,804,000
Other | 621,000 | 710,000
Total gross deferred tax assets, current | 3,615,000 | 4,514,000
Deferred tax assets, noncurrent |  |
Net operating loss carryforwards | 111,339,000 | 104,893,000
R&D credit carryforwards | 6,277,000 | 6,032,000
Depreciation/amortization deferred | 24,526,000 | 26,594,000
Other | 7,544,000 | 7,573,000
Total gross deferred tax assets, noncurrent | 149,686,000 | 145,092,000
Total gross deferred tax liabilities, noncurrent | 0 | 0
Net deferred taxes before valuation allowance | 153,301,000 | 149,606,000
Less: Valuation allowance | (153,301,000) | (149,606,000)
Deferred tax assets | $ 0 | $ 0

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