Percentage of Revenue from Significant Customers (Detail) (Sales Revenue)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Orencia Royalties from Bristol
Revenue, Major Customer [Line Items]
Revenue from significant customers as a percentage of total revenue		26.00%		25.00%
Bioprocessing Customer A
Revenue, Major Customer [Line Items]
Revenue from significant customers as a percentage of total revenue	30.00%	28.00%	39.00%	35.00%
Bioprocessing Customer B
Revenue, Major Customer [Line Items]
Revenue from significant customers as a percentage of total revenue	23.00%	10.00%	22.00%	12.00%
Bioprocessing Customer C
Revenue, Major Customer [Line Items]
Revenue from significant customers as a percentage of total revenue	20.00%	20.00%	16.00%	15.00%