Percentage of Revenue from Significant Customers (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Bristol Myers Squibb Company
Revenue, Major Customer [Line Items]
Revenues, percentage by customer	23.00%	36.00%	23.00%	39.00%
Bioprocessing customer A
Revenue, Major Customer [Line Items]
Revenues, percentage by customer	44.00%	42.00%	44.00%	41.00%
Bioprocessing customer B
Revenue, Major Customer [Line Items]
Revenues, percentage by customer	11.00%	6.00%	13.00%	4.00%
Bioprocessing customer C
Revenue, Major Customer [Line Items]
Revenues, percentage by customer	14.00%		12.00%