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Balance Sheet Items - Prepaid Expenses and Other Current Asset (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid expenses	$ 439	$ 245
Research tax credit	304	0
Prepaid research and development costs	569	441
Notes and interest receivable	38	260
Other current assets	686	59
Total	$ 2,036	$ 1,005

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