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Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts Payable and Accrued Expenses |  |
Accounts payable | $ 1,877 | $ 1,386
Accrued compensation | 1,760 | 1,093
Research and development | 1,496 | 2,604
Other | 535 | 298
Total accounts payable and accrued expenses | $ 5,668 | $ 5,381

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