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Component of Current Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accrued Liabilities Abstract    
Payroll and related expenses $ 5,866 $ 4,613
Legal expenses 202 224
Third party research expenses 5,241 5,898
Third party development expenses 2,072 1,000
Return of funding due to AstraZeneca AB (“AstraZeneca”) (Note 9) 7,345  
Other accrued liabilities 1,972 1,520
Total $ 22,698 $ 13,255