Quarterly report pursuant to Section 13 or 15(d)

Collaboration Arrangements - Additional Information (Detail)

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Collaboration Arrangements - Additional Information (Detail) - Merck KGaA - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Upfront and milestone payments received to date $ 110.0  
Revenue recognized by the Company 0.0 $ 3.7
Company received a reimbursement for eligible worldwide development expenses $ 0.8 $ 2.0
Collaborative Arrangement Product Agreement | Evofosfamide    
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Merck KGaA's percentage share of worldwide development expenses 70.00%