Overview Financials News + Filings Key Docs Charts Ownership Insiders
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| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 8-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Revenue | 0.2 | 0.2 | 0.2 | 2.2 | 1.2 | 0.8 | 5.5 | 11.5 |
| Revenue growth | 0.0% | -2.2% | -89.4% | 77.8% | 56.0% | -85.8% | -51.6% | 1332.0% |
| Operating expenses: | | | | | | | | |
| General and administrative | 8.4 | 9.4 | 8.3 | 8.3 | 7.6 | 7.4 | 9.2 | 9.5 |
| Research and development | 11.4 | 7.3 | 16.9 | 15.5 | 16.9 | 19.1 | 20.1 | 25.9 |
| Total operating expenses | 19.9 | 16.7 | 25.2 | 23.9 | 24.5 | 26.5 | 29.2 | 35.4 |
| Loss from operations | -19.6 | -16.5 | -25.0 | -21.7 | -23.3 | -25.7 | -23.7 | -24.0 |
| Operating margin | -8684.5% | -7299.1% | -10819.5% | -994.0% | -1895.9% | -3270.3% | -427.4% | -209.3% |
| Other income, net | 0.7 | 0.0 | 0.0 | 0.1 | 1.2 | 0.0 | 0.1 | 0.0 |
| Net loss | | -16.2 | -25.2 | -21.5 | -20.4 | -24.1 | -19.7 | -24.0 |
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| Net loss per share, basic (in dollars per share) | ($0.91) | ($0.96) | ($2.17) | ($1.49) | ($4.99) | ($40.15) | ($4.44) | ($10.54) |
| Net loss per share, diluted (in dollars per share) | ($0.91) | ($0.96) | ($2.17) | ($1.49) | ($4.99) | ($40.15) | ($4.44) | ($10.54) |
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| Basic weighted average shares outstanding (in shares) | 20.9 | 16.8 | 11.6 | 14.4 | 4.1 | 0.6 | 4.4 | 2.3 |
| Diluted weighted average shares outstanding (in shares) | 20.9 | 16.8 | 11.6 | | | | | |
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