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Supplemental Balance Sheet Information - Prepaid expenses and other current assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Supplemental Balance Sheet Information [Abstract]
Prepaid clinical, contract research and manufacturing costs	$ 3,388	$ 2,336
Interest receivable	44	161
Prepaid insurance	254	694
Other	902	1,040
Prepaid expenses and other current assets	$ 4,588	$ 4,231

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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