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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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The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

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The noncurrent portion (due beyond one year or one operating cycle) of other accrued expenses (expenses incurred at the end of the reporting period but not yet paid) not otherwise defined in the taxonomy.

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Cash paid to purchase assets other than those represented by other elements (securities, loans, mortgages, real estate).

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The amount the entity has committed to make for future royalty guarantees.

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