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Intangible Assets (Schedule of Net Book Value of Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 Year | Dec. 31, 2011 | Jun. 30, 2011
--- | --- | --- | ---
Intangible Assets [Line Items] |  |  |
Net book value of intangible assets | $ 4,226 | $ 4,596 | $ 21,564
Estimated remaining useful life | 5.5 |  |
Durasert |  |  |
Intangible Assets [Line Items] |  |  |
Net book value of intangible assets | 2,912 |  | 6,845
Estimated remaining useful life | 5.5 |  |
BioSilicon |  |  |
Intangible Assets [Line Items] |  |  |
Net book value of intangible assets | $ 1,314 |  | $ 14,719
Estimated remaining useful life | 5.5 |  |

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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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