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Component of Current Accrued Liabilities and Accrued Research and Development (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accrued Liabilities Abstract    
Payroll and related expenses $ 6,180 $ 3,753
Legal expenses 346 275
Litigation settlements accrual (Note 9)   4,975
Third party research expenses 3,567 2,784
Third party development expenses 522 2,002
Other accrued liabilities 3,439 2,451
Total $ 14,054 $ 16,240