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Co-Promotion Agreement - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2014
Co-Promotion Agreement [Line Items]
Promotion fee as a percentage gross margin	From the high single digits in 2014 to the low twenty percent levels in 2018.
Kowa Pharmaceuticals America | Minimum
Co-Promotion Agreement [Line Items]
Number of sales representatives	250

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Number Of Sales Representative

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- Definition

Range of Percentage of Gross Margin Payable for Co-Promotion Agreement

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