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Component of Current Accrued Liabilities and Accrued Research and Development (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accrued Liabilities Abstract |  |
Payroll and related expenses | $ 6,653 | $ 8,058
Revenue reserve accruals | 3,893 | 1,033
Third party research expenses | 2,308 | 7,819
Third party development expenses | 505 | 1,377
Restructuring liability | 675 |
Other accrued liabilities | 4,888 | 7,468
Total | $ 18,922 | $ 25,755

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