v3.19.3

Note 5 - Other Balance Sheet Information (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Notes Tables |  |
Schedule of Prepaid and Other Current Assets [Table Text Block] |
|  | December 31, 2018 |  | June 30, 2019 |
Prepaid clinical trial expenses |  | $ | 5 |  | $ | 435 |
Equity issuance costs |  | — |  | 343 |
Prepaid insurance |  | — |  | 670 |
Other prepaid expenses |  | 5 |  | 174 |
Total prepaid and other current assets |  | $ | 10 |  | $ | 1,622 |
Schedule of Accrued Liabilities [Table Text Block] |
|  | December 31, 2018 |  | June 30, 2019 |
Payroll and related expenses |  | $ | 241 |  | $ | 508 |
Accrued term loan final payment |  | 421 |  | 569 |
Accrued clinical trial expense |  | — |  | 8 |
Professional fees and other costs |  | 195 |  | 395 |
Total accrued liabilities |  | $ | 857 |  | $ | 1,480 |
|  | As of December 31,
|  | 2017 |  | 2018
Payroll and related expenses |  | $ | 273 |  | $ | 241
Accrued term loan final payment |  |  | 197 |  |  | 421
Accrued clinical trial expense |  |  | 654 |  |  | —
Professional fees and other costs |  |  | 34 |  |  | 195
Total accrued liabilities |  | $ | 1,158 |  | $ | 857

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