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SUPPLEMENTAL BALANCE SHEET DISCLOSURES - Prepaid expenses and other current assets (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Supplemental Balance Sheet Disclosures |  |
Prepaid expenses | $ 588 | $ 817
Inventory related | 330 | 399
Total prepaid expenses and other current assets | $ 918 | $ 1,216

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