v3.19.3

Note 5 - Other Balance Sheet Information - Prepaid and Other Current Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Prepaid clinical trial expenses | $ 435 | $ 5 |
Equity issuance costs | 343 |  |
Prepaid insurance | 670 |  |
Other prepaid expenses | 174 | 5 |
Total prepaid and other current assets | $ 1,622 | $ 10 | $ 34

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