Percentage of Revenue from Significant Customers (Detail) (Sales)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Orencia Royalties from Bristol
Revenue, Major Customer [Line Items]
Revenue from significant customers as a percentage of total revenue		25.00%		24.00%
Bioprocessing Customer A
Revenue, Major Customer [Line Items]
Revenue from significant customers as a percentage of total revenue	48.00%	39.00%	44.00%	38.00%
Bioprocessing Customer B
Revenue, Major Customer [Line Items]
Revenue from significant customers as a percentage of total revenue	22.00%	15.00%	22.00%	14.00%
Bioprocessing Customer C
Revenue, Major Customer [Line Items]
Revenue from significant customers as a percentage of total revenue	14.00%	10.00%	14.00%	13.00%