Percentage of Accounts Receivable by Significant Customers (Detail) (Accounts Receivable)	Jun. 30, 2013	Dec. 31, 2012
Orencia Royalties from Bristol
Concentration Risk [Line Items]
Accounts receivable, percentage by customer	42.00%	31.00%
Bioprocessing Customer A
Concentration Risk [Line Items]
Accounts receivable, percentage by customer	29.00%	21.00%
Bioprocessing Customer B
Concentration Risk [Line Items]
Accounts receivable, percentage by customer	10.00%	4.00%
Tenant improvement allowance due from landlord
Concentration Risk [Line Items]
Accounts receivable, percentage by customer	10.00%
Pfizer
Concentration Risk [Line Items]
Accounts receivable, percentage by customer		38.00%