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Accrued Expenses and Other Payables (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Accrued Expenses and Other Payables |  |
Accrued clinical and research related expenses | $ 8,956 | $ 7,232
Accrued employee related expenses | 1,731 | 4,637
Accrued interest payable | 68 | 68
Accrued professional service fees | 725 | 301
Other | 136 | 122
Total accrued expenses and other payables | $ 11,616 | $ 12,360

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