In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 |
| 10-K | 10-K | 10-K | 10-K | 10-K | S-1/A |
Cash flows from operating activities: | | | | | | |
Net loss | -25.3 | -14.5 | -5.5 | -1.0 | | |
Adjustments to reconcile net loss to net cash used in operating activities: | | | | | | |
Stock-based compensation expense | 9.2 | 4.7 | 1.9 | 0.0 | | |
Changes in operating assets and liabilities: | | | | | | |
Prepaid expenses and other current assets | -7.3 | -0.3 | 0.0 | 0.0 | | |
Accounts payable | 3.3 | 0.3 | -0.7 | 1.0 | | |
Accrued expenses | 2.9 | 0.6 | -0.4 | 0.2 | | |
Net cash used in operating activities | -17.3 | -9.1 | -4.0 | -0.5 | | |
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Cash flows from financing activities: | | | | | | |
Proceeds from issuance of common stock, net of issuance costs | | | 12.0 | | | |
Proceeds from exercise of stock options | 0.0 | 0.1 | 0.0 | | | |
Net cash provided by financing activities | 0.0 | 46.7 | 12.0 | 0.4 | | |
Net (decrease) increase in cash and cash equivalents | -17.3 | 37.6 | | | | |