| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Jun-30-19 | Jun-30-18 | Jun-30-17 | Jun-30-16 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Cash flows from operating activities | | | | | | | | |
| Net loss | -157.0 | -125.8 | | | | -9.0 | -6.3 | -3.0 |
| |
| Adjustments to reconcile net loss to net cash used in operating activities: | | | | | | | | |
| Stock-based compensation | 44.2 | 40.5 | 20.8 | 3.2 | 1.2 | 0.5 | 0.7 | 1.2 |
| Gain on settlement of fees | -6.4 | | | | | | | |
| Realized loss (gain) on short-term investments | 0.6 | 0.6 | | | | | | |
| Change in operating assets and liabilities: | | | | | | | | |
| Lease payment receivable | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | | |
| Other receivables | | | | | -0.2 | 0.2 | 0.0 | -0.2 |
| Prepaid expenses and other assets | 7.3 | -10.4 | -0.5 | 0.5 | 0.3 | 0.0 | 0.4 | |
| Accounts payable | 0.4 | 2.8 | 7.8 | 0.2 | 0.2 | 0.2 | -0.7 | 0.4 |
| Accrued expenses | 3.3 | -0.4 | 3.4 | -0.6 | 1.2 | 0.2 | -0.3 | 0.2 |
| Net cash (used in) operating activities | -103.8 | -91.9 | -27.8 | -12.1 | -10.5 | -6.0 | -6.5 | -13.1 |
| |
| Cash flows from investing activities | | | | | | | | |
| Purchase of short-term investments | -47.3 | -223.0 | -182.1 | | | | | |
| Sale of short-term investments | 67.0 | 168.9 | | | | | | |
| Net cash provided by (used in) investing activities | 19.7 | -54.1 | -34.4 | -80.2 | | 0.0 | 0.0 | -0.6 |
| |
| Cash flows from financing activities | | | | | | | | |
| Proceeds from issuance of common stock, net | 0.0 | 184.6 | 19.8 | | | | | |
| Proceeds from options exercised for common stock | | | 0.7 | | | | | |
| Proceeds from warrants exercised for common stock | | | 8.1 | | | | | |
| Net cash provided by financing activities | 45.0 | 187.9 | 28.5 | 126.1 | 17.5 | 6.5 | -0.3 | -0.3 |
| |
| Cash paid during the period for: | | | | | | | | |
| Interest | | | | | | | | |
| Income Tax | | | | | | | | |