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Discontinued Operations - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2011 | Dec. 31, 2009 | Dec. 31, 2012
Discontinued Operations [Line Items] |  |  |
Non cash consideration received in sale of interest in subsidiary | $ 2,500,000 |  |
Contingent amount to be received under discontinued business | 140,000,000 |  |
Period of revenue milestones considered for contingent payment |  |  | 10 years
Upfront consideration of discontinued operation |  | 350,000 |
Reimbursements of patent and license expenses |  | 80,000 |
Convertible bond [Member] |  |  |
Discontinued Operations [Line Items] |  |  |
Convertible bond, face value | $ 2,500,000 |  |
Convertible bond, conversion date |  |  | Jan. 17, 2012
Convertible bond, redeemable date |  |  | 2013-01-17
Convertible bond, due date |  |  | Jan. 17, 2014

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