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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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