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Commitments and Contingencies - Additional Information (Detail) In Millions, unless otherwise specified |  | 3 Months Ended |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2013 USD ($) | Mar. 31, 2013 Laxdale Limited USD ($) | Jul. 26, 2012 Laxdale Limited USD ($) | Mar. 31, 2013 Amr One Hundred One USD ($) Contract | Mar. 31, 2013 Amr One Hundred One Maximum USD ($) | Mar. 31, 2013 Fourth API supplier Maximum USD ($) | Mar. 31, 2013 Slanhmor USD ($) | Mar. 31, 2013 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 1 USD ($) | Mar. 31, 2013 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 1 GBP (£) | Mar. 31, 2013 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 2 USD ($) | Mar. 31, 2013 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 2 GBP (£) | Mar. 31, 2013 Further Indication for AMR101 Laxdale Limited Maximum USD ($) | Mar. 31, 2013 Further Indication for AMR101 Laxdale Limited Maximum GBP (£) | Mar. 31, 2013 First Indication for AMR101 Laxdale Limited Potential Marketing Approval 1 USD ($) | Mar. 31, 2013 First Indication for AMR101 Laxdale Limited Potential Marketing Approval 1 GBP (£) | Mar. 31, 2013 First Indication for AMR101 Laxdale Limited Potential Marketing Approval 2 USD ($) | Mar. 31, 2013 First Indication for AMR101 Laxdale Limited Potential Marketing Approval 2 GBP (£)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum purchase obligations | $ 5.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of signed agreements |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Development fees committed |  |  |  |  | 0.5 | 2.3 |  |  |  |  |  |  |  |  |  |  |
Raw material purchase commitment |  |  |  | 1.1 | 5.0 | 15.0 |  |  |  |  |  |  |  |  |  |  |
Payment made under the agreements |  |  |  |  |  |  | 3.9 |  |  |  |  |  |  |  |  |  |
Potential aggregate stock or cash payment |  |  |  |  |  |  |  | 7.6 | 5.0 | 7.6 | 5.0 | 15.2 | 10.0 | 11.4 | 7.5 | 11.4 | 7.5
Accrued liability payable |  |  | 11.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  | $ 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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