Percentage of Revenue from Significant Customers (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Bristol Myers Squibb Company
Revenue, Major Customer [Line Items]
Revenues, percentage by customer	26.00%	32.00%	24.00%	36.00%
Bioprocessing Customer A
Revenue, Major Customer [Line Items]
Revenues, percentage by customer	49.00%	58.00%	46.00%	48.00%
Bioprocessing Customer B
Revenue, Major Customer [Line Items]
Revenues, percentage by customer	8.00%	3.00%	11.00%	4.00%
Bioprocessing Customer C
Revenue, Major Customer [Line Items]
Revenues, percentage by customer	12.00%		12.00%