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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Contingency [Line Items] |  |  |  |  |
Federal tax at statutory rate |  | 34.00% | 34.00% | 34.00% |
Reduction to federal deferred tax assets |  | $ 29,480 |  |  |
Corporate alternative minimum tax, deferred tax benefit |  | 102 |  |  |
Research and development credit carryforward |  | 5,339 | $ 5,446 |  |
Pre-tax book loss for domestic operations |  | (19,409) | (27,271) | $ (21,157) |
Pre-tax book loss for international operations |  | (7,469) | (6,027) | (6,019) |
Undistributed earnings of foreign subsidiaries |  | 107 |  |  |
Unrecognized deferred tax assets |  | 2,816 | 2,816 |  |
Deferred tax assets tax credit carryforwards research and unrecognized tax benefits reduction from IRS audit |  | 2,018 |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | 0 | 0 | 0 |
Unrecognized tax benefits |  | 1,157 | $ 3,175 | $ 1,982 | $ 1,982
Scenario, Plan [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Federal tax at statutory rate | 21.00% |  |  |  |
Federal [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforward |  | 240,286 |  |  |
Research and development credit carryforward |  | 6,392 |  |  |
State [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforward |  | 147,841 |  |  |
Foreign [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforward |  | $ 30,501 |  |  |
Minimum [Member] | Federal [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforward, expiration year |  | Dec. 31, 2021 |  |  |
Research and development credit credit carryforwards expiration year |  | Dec. 31, 2022 |  |  |
Minimum [Member] | State [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforward, expiration year |  | Dec. 31, 2018 |  |  |
Minimum [Member] | Foreign [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforward, expiration year |  | Dec. 31, 2018 |  |  |
Maximum [Member] | Federal [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforward, expiration year |  | Dec. 31, 2038 |  |  |
Research and development credit credit carryforwards expiration year |  | Dec. 31, 2038 |  |  |
Maximum [Member] | State [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforward, expiration year |  | Dec. 31, 2038 |  |  |
Maximum [Member] | Foreign [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforward, expiration year |  | Dec. 31, 2027 |  |  |

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