Percentage of Revenue from Significant Customers (Detail)	9 Months Ended	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Mar. 31, 2011
Orencia Royalties from Bristol
Revenue, Major Customer [Line Items]
Revenues, percentage by customer	37.00%	37.00%	24.00%	38.00%
Bioprocessing Customer A
Revenue, Major Customer [Line Items]
Revenues, percentage by customer	44.00%	45.00%	42.00%	42.00%

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

No definition available.

Name:	us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration