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Selected Balance Sheet Information - Schedule of prepaid expenses and other current assets (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Selected Balance Sheet Information |  |
Prepaid manufacturing expense | $ 1,001 | $ 0
Prepaid insurance | 197 | 419
Prepaid consulting, subscriptions and other expenses | 96 | 132
Other receivable | 4 | 0
Prepaid conferences, travel | 0 | 42
Total | $ 1,298 | $ 593

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