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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 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Assets |
| Cash and equivalents | 31.2 | 51.8 | 18.8 | 62.5 | 73.3 | 15.7 | 43.9 | 43.2 |
| Short-term investments | | | | | 4.4 | 51.5 | 70.5 | 83.4 |
| Other current assets | 1.7 | 17.1 | 1.0 | 8.7 | 5.8 | 1.6 | 2.1 | 3.2 |
| Total current assets | 33.0 | 69.0 | 19.8 | 71.1 | 83.4 | 68.8 | 116.4 | 129.9 |
| Property, plant, and equipment, net | 1.1 | 1.1 | 1.1 | | | 3.1 | 5.6 | 8.3 |
| Other fixed assets | 0.4 | 0.1 | 0.1 | 0.5 | 0.2 | 0.0 | 0.0 | |
| Total assets | 46.1 | 73.2 | 22.9 | 75.0 | 84.1 | 72.9 | 122.5 | 138.6 |
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| Accounts payable | 1.1 | 1.0 | 1.1 | 1.5 | 2.0 | 2.2 | 2.2 | 3.4 |
| Accrued expenses | 3.0 | 15.9 | 0.7 | 9.1 | 7.6 | 5.6 | 11.0 | 7.9 |
| Current portion of long-term debt | 0.0 | 0.0 | 0.0 | 0.2 | 0.2 | 0.0 | 0.0 | 0.0 |
| Current portion of long-term debt | | | | 0.2 | 0.2 | | | |
| Other current liabilities | 3.2 | 3.1 | 1.5 | 1.8 | | | | |
| Total current liabilities | 7.3 | 20.0 | 3.2 | 12.5 | 9.8 | 7.8 | 13.2 | 11.2 |
| Long-term debt | 10.4 | 15.1 | | 0.2 | 0.4 | | | |
| Other liabilities | 10.3 | 2.0 | 1.7 | 2.4 | 0.8 | 0.8 | 1.1 | 0.5 |
| Total liabilities | 28.0 | 37.1 | 4.9 | 15.1 | 11.0 | 8.6 | 14.3 | 11.8 |
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| Shareholders' equity [+] | 18.1 | 36.1 | 17.9 | 59.9 | 73.1 | 64.3 | 108.2 | 126.9 |
| Paid-in capital | 153.9 | 136.2 | 3.0 | 267.0 | 234.9 | 365.8 | 358.4 | 294.9 |
| Retained earnings | -135.8 | -100.1 | -71.8 | -208.7 | -164.1 | -301.5 | -250.2 | -167.9 |
| Tangible shareholders' equity | 18.1 | 36.1 | 17.9 | 59.9 | 73.1 | 64.3 | 108.2 | 126.9 |
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