| In millions, except per share items | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 10-Q | 8-K | 10-Q |
| Cash flows from operating activities | | | | | |
| Net loss | -192.4 | -176.1 | -182.0 | -172.0 | -54.4 |
| |
| Adjustments to reconcile net loss to net cash used in operating activities: | | | | | |
| Depreciation and amortization | 1.4 | 1.1 | 0.9 | | 0.8 |
| Stock-based compensation, net of amounts capitalized | 39.9 | 29.6 | 17.7 | | 1.7 |
| Change in fair value of warrants | -38.9 | -37.5 | -14.0 | 8.2 | |
| Net amortization of premiums and accretion of discounts on investments | | | | | 0.3 |
| Amortization of debt discount | | | | | 3.7 |
| Change in the fair value of derivative liability | -47.1 | -44.7 | | | 5.8 |
| Loss on sale of property, equipment and software | -0.1 | | | | |
| Issuance of common stock for services | -38.9 | -37.5 | -14.0 | 8.2 | |
| Changes in operating assets and liabilities: | | | | | |
| Prepaid expenses and other current assets | 3.1 | 7.7 | -0.3 | | -1.1 |
| Other assets | -2.8 | -3.7 | -3.3 | | -3.2 |
| Accounts payable | 1.1 | 3.2 | 4.1 | | 2.8 |
| Other long-term liabilities | | | 0.1 | | 0.0 |
| Accrued expenses and other current liabilities | 4.5 | 2.1 | 4.5 | | 2.4 |
| Net cash used in operating activities | -132.3 | -119.1 | -110.3 | -98.9 | -39.7 |
| |
| Cash flows from investing activities | | | | | |
| Maturities of investments | | | | | 48.2 |
| Proceeds from sale of property, equipment and software | 0.4 | | | | |
| Purchase of property, equipment and software | -8.2 | -5.2 | -3.1 | | -4.6 |
| Net cash provided by (used in) investing activities | 41.7 | 57.3 | 76.1 | 95.0 | 49.9 |
| |
| Cash flows from financing activities | | | | | |
| Cash proceeds received from convertible note payable | | | | | 25.0 |
| Payment towards notes payable | -0.3 | -0.2 | -0.2 | | -0.4 |
| Proceeds from exercise of stock options | 1.3 | 1.2 | 0.4 | | 0.1 |
| Deferred offering costs | | | | | -0.8 |
| Net cash provided by financing activities | 271.0 | 270.2 | 294.5 | 294.3 | 24.2 |
| Net increase (decrease) in cash, cash equivalents and restricted cash | -73.1 | -45.1 | 6.7 | | 36.8 |
| |
| Supplemental disclosures of cash flow information: | | | | | |
| Cash paid during the period for interest | | | 0.0 | | 0.0 |
| Supplemental schedule of noncash investing and financing activities | | | | | |
| Acquisition of property, equipment and software in accounts payable | 1.0 | 0.4 | 0.2 | | |
| Acquisition of trucks by assuming notes payable | 1.4 | 1.0 | | | |
| Stock-based compensation capitalized into internally developed software | 1.1 | 1.0 | 0.3 | | 0.2 |
| Vesting of early exercised stock options | 0.0 | 0.0 | 0.0 | | 0.0 |
| Issuance of common stock for services | | 0.7 | | | |