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Commitments and Contingencies - Additional Information (Detail) In Millions, unless otherwise specified	6 Months Ended		6 Months Ended
	Jun. 30, 2013 Laxdale Limited USD ($)	Jul. 26, 2012 Laxdale Limited USD ($)	Jun. 30, 2013 Amr One Hundred One USD ($) Contract	Jun. 30, 2013 Amr One Hundred One Maximum USD ($)	Jun. 30, 2013 Fourth API supplier Maximum USD ($)	Jun. 30, 2013 Slanhmor USD ($)	Jun. 30, 2013 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 1 USD ($)	Jun. 30, 2013 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 1 GBP (£)	Jun. 30, 2013 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 2 USD ($)	Jun. 30, 2013 Further Indication for AMR101 Laxdale Limited Potential Marketing Approval 2 GBP (£)	Jun. 30, 2013 Further Indication for AMR101 Laxdale Limited Maximum USD ($)	Jun. 30, 2013 Further Indication for AMR101 Laxdale Limited Maximum GBP (£)	Jun. 30, 2013 First Indication for AMR101 Laxdale Limited Potential Marketing Approval 1 USD ($)	Jun. 30, 2013 First Indication for AMR101 Laxdale Limited Potential Marketing Approval 1 GBP (£)	Jun. 30, 2013 First Indication for AMR101 Laxdale Limited Potential Marketing Approval 2 USD ($)	Jun. 30, 2013 First Indication for AMR101 Laxdale Limited Potential Marketing Approval 2 GBP (£)
Commitments and Contingencies Disclosure [Line Items]
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						5.3
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	$ 0.3

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Number of Agreements

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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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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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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Amount of cash paid to purchase other assets as part of operating activities.

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

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