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Supplemental Balance Sheet Information - Prepaid expenses and other current assets (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Supplemental Balance Sheet Information [Abstract] |  |
Prepaid clinical, contract research and manufacturing costs | $ 2,203 | $ 481
Interest receivable | 221 | 236
Prepaid insurance | 212 | 533
Other | 952 | 705
Prepaid expenses and other current assets | $ 3,588 | $ 1,955

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