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Income Taxes (Narrative) (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Net operating loss carryforwards ("NOLs") | $ 182,300,000 |
Operating loss carryforward, expiration date | Dec. 31, 2019 |
Interest and penalties pertaining to income tax examination recognized | $ 0 | $ 0
Maximum [Member] |  |
Income tax examination, years under examination | 2015 |
Minimum [Member] |  |
Income tax examination, years under examination | 1998 |
Domestic Tax Authority [Member] |  |
Tax credit carryforward, expiration date | Dec. 31, 2019 |
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member] |  |
Tax credit carryforward | $ 5,200,000 |
Foreign Tax Authority [Member] |  |
Net operating loss carryforwards ("NOLs") | 8,500,000 |
Tax Year 2015 [Member] | Foreign Tax Authority [Member] |  |
Net operating loss carryforwards ("NOLs") | $ 3,000,000 |

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