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Component of Current Accrued Liabilities and Accrued Research and Development (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accrued Liabilities Abstract |  |
Payroll and related expenses | $ 8,058 | $ 6,180
Legal expenses | 151 | 346
Revenue reserves liability | 1,033 |
Third party research expenses | 7,819 | 3,567
Third party development expenses | 1,377 | 522
Other accrued liabilities | 7,317 | 3,439
Total | $ 25,755 | $ 14,054

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