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Fair Value Measurements - Additional Information (Detail) (USD $) |  |  |  | 1 Months Ended | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2010 | Apr. 30, 2010 April 2010 Warrants | Jun. 30, 2010 Warrant Liability | Dec. 31, 2011 Contingent Consideration Liabilities | Dec. 31, 2010 Contingent Consideration Liabilities | Dec. 31, 2011 Fair Value, Inputs, Level 3 | Dec. 31, 2011 Fair Value, Inputs, Level 3 Contingent Consideration Liabilities | Dec. 31, 2010 Fair Value, Inputs, Level 3 Contingent Consideration Liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |
Cash flows discounted rate |  | 16.00% |  |  |  |  |  |  |
Changes in fair value of contingent consideration liability |  |  |  | $ 9,500,000 | $ (843,000) | $ (2,197,000) |  | $ (800,000) | $ (2,200,000)
Estimated fair value of contingent liability |  |  |  |  |  |  | 0 |  |
Common stock shares outstanding as converted basis | 10,913,873 |  | 7,038,210 |  |  |  |  |  |
Reclassification of warranty liability into equity |  |  |  | $ 12,000,000 |  |  |  |  |

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- Definition Aggregate amount of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 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.(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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