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Income Taxes (Summary Of Difference Between Effective Income Tax Rates And Federal Statutory Rate) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Abstract] |  |  |
Federal tax at statutory rate | 34.00% | 34.00% | 34.00%
Federal tax rate change | (109.68%) |  |
Federal R&D credit | (0.40%) | 2.89% | 3.23%
Federal NOL adjustment for ASU | 10.48% |  |
Valuation allowance | 55.84% | (24.93%) | (31.30%)
State income taxes | 4.81% | (0.69%) | 1.38%
Foreign NOL rate change | 1.30% | (1.36%) | (2.02%)
Foreign tax rate differential | (2.45%) | (1.62%) | (1.99%)
Permanent differences and other | 6.05% | (8.41%) | (3.43%)
Effective tax rate, Total | (0.05%) | (0.12%) | (0.13%)
Federal tax at statutory rate | $ (9,139) | $ (11,322) | $ (9,240)
Federal tax rate change | 29,480 |  |
Federal R&D credit | 107 | (962) | (878)
Federal NOL adjustment for ASU | (2,816) |  |
Valuation allowance | (15,009) | 8,300 | 8,507
State income taxes | (1,292) | 231 | (375)
Foreign NOL rate change | (348) | 452 | 549
Foreign tax rate differential | 658 | 539 | 542
Permanent differences and other | (1,627) | 2,802 | 931
Total tax expense | $ 14 | $ 40 | $ 36

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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