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Selected Balance Sheet Information - Schedule of PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Selected Balance Sheet Information |  |
Prepaid insurance | $ 803 | $ 639
Prepaid clinical research organizations | 458 | 470
Prepaid consulting, subscriptions and other expenses | 272 | 90
Stock sales receivable | 0 | 469
Prepaid manufacturing expenses | 0 | 39
Total | $ 1,533 | $ 1,707

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