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Income Taxes (Narrative) (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Operating loss carryforward, expiration date |  | Dec. 31, 2018 |
Unrecognized tax benefits | $ 2,100,000 | $ 2,100,000 | $ 2,100,000
Income tax expense (benefit) | $ (73,000) | (556,000) | $ (73,000)
Income tax expense (benefit) related to reduction of existing deferred tax liability |  | $ (200,000) |
United Kingdom enacted tax rate | 20.00% | 17.00% | 20.00%
Interest and penalties pertaining to income tax examination recognized |  | $ 0 | $ 0
In Process Research and Development [Member] |  |  |
Income tax expense (benefit) related to reduction of existing deferred tax liability |  | (400,000) |
Impairment of in-process research and development |  | $ 2,000,000 |
Maximum [Member] |  |  |
Income tax examination, years under examination |  | 2015 |
Minimum [Member] |  |  |
Income tax examination, years under examination |  | 1998 |
Domestic Tax Authority [Member] |  |  |
Net operating loss carryforwards ("NOLs") |  | $ 190,700,000 |
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member] |  |  |
Tax credit carryforward |  | $ 3,100,000 |
Tax credit carryforward, expiration date |  | Dec. 31, 2018 |
Unrecognized tax benefits |  | $ 2,100,000 |
Foreign Tax Authority [Member] |  |  |
Net operating loss carryforwards ("NOLs") |  | 8,900,000 |
Tax Year 2016 [Member] | Foreign Tax Authority [Member] |  |  |
Net operating loss carryforwards ("NOLs") |  | $ 300,000 |

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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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- Definition The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount 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 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 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)) -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 -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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