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Ester Asset Purchase - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Aug. 31, 2009 Ester Asset Purchase | Dec. 31, 2008 Ester Asset Purchase | Dec. 31, 2007 Ester Asset Purchase | Dec. 31, 2009 Ester Asset Purchase | Dec. 01, 2007 Ester Asset Purchase
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |  |  |  |  |
Asset Purchase, percentage of outstanding share capital acquired |  |  |  |  |  | 100.00% |  |
Asset purchase, upfront payment |  |  |  |  |  | $ 5,200,000 |  |
Asset purchase, common stock given |  |  |  |  |  | 10,000,000 |  |
Asset purchase, Fair value of common stock issued |  |  |  | 1,800,000 |  | 9,000,000 |  |
Asset purchase, maximum variable contingent payment amount |  |  |  |  |  | 5,000,000 |  |
Asset purchase, fair value of stock based liability |  |  |  |  | 900,000 | 3,400,000 | 900,000 | 4,800,000
Compensation (income) expense | $ 9,294,000 | $ 5,207,000 | $ 2,859,000 | $ 900,000 | $ (2,500,000) | $ (1,400,000) |  |
Asset purchase, Common shares issued in settlement of stock based liability |  |  |  | 1,315,789 |  |  |  |

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- Definition The level of ownership or equity interest acquired in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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