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License Agreements (Additional Information) (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 9 Months Ended |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 13, 2014 | Oct. 31, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Orexo [Member] | Oct. 31, 2013 Orexo [Member] | Sep. 30, 2014 M D Anderson Cancer Center [Member]
License And Collaboration Agreements [Line Items] |  |  |  |  |  |  |  |
Annual maintenance fee |  |  |  |  |  |  |  | $ 200,000
Milestone payment for Phase 3 |  |  | 3,222,000 |  | 0 |  |  | 200,000
Cash paid for acquisition of Abstral rights |  | 10,000,000 |  |  |  |  |  |
Remaining cash held of Abstral rights |  |  |  |  |  |  | 5,000,000 |
Estimated year of licensed patents expiration |  |  |  |  |  | 2019 |  |
Payments to Acquire Businesses, Gross | $ 2,000,000 |  | $ 2,315,000 | $ 0 |  |  |  |

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