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Component of Current Accrued Liabilities and Accrued Research and Development (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accrued Liabilities Abstract    
Payroll and related expenses $ 3,753 $ 5,866
Legal expenses 275 202
Litigation settlements accrual (Note 7) 4,975  
Third party research expenses 2,784 5,241
Third party development expenses 2,002 2,072
Return of unused development funding to AstraZeneca (Note 9)   7,345
Other accrued liabilities 2,451 1,972
Total $ 16,240 $ 22,698