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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 | 57.2 | 175.7 | 45.0 | 24.8 | 67.8 | 20.5 | 17.1 | 58.7 |
| Short-term investments | | | 132.0 | 116.6 | 51.6 | 23.2 | 47.1 | |
| Accounts receivable, net | 1.0 | 2.8 | 1.8 | 0.8 | 0.2 | 0.4 | 0.2 | 0.3 |
| Other current assets | 542.1 | 380.6 | 3.0 | 2.7 | 1.9 | 0.7 | 1.3 | 1.9 |
| Total current assets | 600.3 | 559.0 | 181.8 | 144.9 | 121.3 | 44.8 | 65.7 | 60.9 |
| Property, plant, and equipment, net | 6.5 | 4.5 | 3.6 | 1.7 | 1.0 | 1.1 | 1.4 | 2.0 |
| Total assets | 754.1 | 572.0 | 189.2 | 147.7 | 122.4 | 46.1 | 67.5 | 63.9 |
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| Accounts payable | 8.5 | 3.8 | 3.0 | 2.5 | 0.7 | 1.3 | 1.5 | 1.1 |
| Accrued expenses | 6.2 | 6.2 | 3.0 | 3.0 | 2.0 | 1.3 | 1.0 | 1.0 |
| Current portion of long-term debt | 0.0 | 0.0 | 0.0 | 4.7 | 0.0 | 0.7 | 0.0 | 0.0 |
| Current portion of long-term debt | | | | 4.7 | | 0.7 | | |
| Deferred revenues | | | | | | | | 0.2 |
| Other current liabilities | 8.0 | 4.3 | 8.7 | 33.2 | 1.5 | 0.9 | 1.2 | 0.6 |
| Total current liabilities | 22.7 | 14.3 | 14.8 | 43.4 | 4.1 | 4.1 | 3.6 | 2.8 |
| Long-term debt | | | | 10.9 | 15.0 | 6.1 | | |
| Other liabilities | 9.9 | 7.7 | 3.1 | 1.5 | | | | 0.1 |
| Total liabilities | 32.6 | 22.0 | 17.8 | 55.7 | 19.1 | 10.2 | 3.6 | 2.9 |
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| Shareholders' equity [+] | 721.5 | 550.0 | 171.4 | 92.0 | 103.3 | 35.9 | 63.9 | 61.0 |
| Paid-in capital | 142.1 | 117.5 | 45.4 | 40.6 | 38.5 | 36.5 | 34.3 | 33.1 |
| Retained earnings | -482.7 | -357.4 | -278.5 | -249.7 | -207.9 | -173.4 | -142.7 | -119.7 |
| Tangible shareholders' equity | 721.5 | 550.0 | 171.4 | 92.0 | 103.3 | 35.9 | 63.9 | 61.0 |
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