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Selected Balance Sheet Information - Schedule of prepaid expenses and other current assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Selected Balance Sheet Information
Prepaid clinical research organizations	$ 880	$ 470
Prepaid insurances	280	639
Prepaid consulting, subscriptions and other expenses	181	90
Stock sales receivable	0	469
Prepaid manufacturing expenses	0	39
Total	$ 1,341	$ 1,707

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