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Selected Balance Sheet Information - Schedule of prepaid expenses and other current assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Selected Balance Sheet Information |  |
Prepaid manufacturing expenses | $ 622 | $ 0
Prepaid insurance | 549 | 419
Prepaid consulting, subscriptions and other expenses | 134 | 132
Prepaid clinical research organizations | 48 | 0
Prepaid conferences, travel | 25 | 42
Other receivable | 3 | 0
Total | $ 1,381 | $ 593

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