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Selected Balance Sheet Information - Schedule of prepaid expenses and other current assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Selected Balance Sheet Information |  |
Prepaid clinical research organizations | $ 1,182 | $ 470
Prepaid consulting, subscriptions and other expenses | 157 | 90
Prepaid insurances | 83 | 639
Stock sales receivable | 0 | 469
Prepaid manufacturing expenses | 0 | 39
Total | $ 1,422 | $ 1,707

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