| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Revenue | | | | | | | | |
| Revenue | 19.3 | 18.4 | 19.4 | 16.9 | | 13.9 | 11.5 | 7.9 |
| Revenue growth | | 32.4% | 69.0% | 113.4% | | 90.5% | 79.3% | 49.3% |
| Costs and expenses | | | | | | | | |
| Costs excluding depreciation and amortization | | | | | | | | |
| Selling, general and administrative | 18.8 | 18.9 | 20.7 | 18.7 | | 22.5 | 28.7 | 40.7 |
| Research and development | 0.2 | 0.2 | 0.3 | 0.2 | | 0.1 | 0.0 | 0.1 |
| Depreciation and amortization | 11.8 | 9.7 | 9.5 | 9.6 | | 7.4 | 4.5 | 3.5 |
| Operating loss | -19.9 | -16.9 | -18.4 | -19.4 | | -27.1 | -31.9 | -49.0 |
| Operating margin | -103.1% | -91.9% | -94.5% | -114.3% | | -195.3% | -277.6% | -616.7% |
| (Loss) gain on derivatives | -11.1 | 1.5 | 1.2 | 7.1 | | 8.1 | 35.0 | 3.8 |
| Income on equity method investment | 0.1 | 0.5 | 1.4 | -0.8 | | 0.3 | 0.2 | -0.2 |
| Interest income | 0.6 | 0.4 | 0.5 | 0.5 | | | | |
| Interest expense | -2.2 | -1.9 | -1.7 | -1.2 | | -1.3 | -1.5 | -1.2 |
| Other expense, net | -0.9 | -0.9 | 2.1 | 0.0 | | 0.0 | 0.1 | -0.4 |
| Loss before income taxes | -33.4 | -17.2 | -14.9 | -13.8 | | -20.0 | 6.0 | -46.9 |
| Income tax expense | 0.0 | -0.1 | | | | | | |
| Net loss | -33.4 | -17.3 | -14.9 | -13.0 | | -20.0 | 5.4 | -46.9 |
| |
| Other comprehensive income | | | | | | | | |
| Total comprehensive loss | -33.4 | -17.3 | -14.9 | -13.0 | | -20.0 | 5.4 | -46.4 |
| |
| Basic and diluted loss per share of common stock: | | | | | | | | |
| Basic: | | | | | | | | |
| Net loss per share of common stock (in dollars per share) | ($0.24) | ($0.14) | ($0.13) | ($0.11) | | ($0.17) | $0.92 | ($0.67) |
| |
| Diluted: | | | | | | | | |
| Net loss per share of common stock, diluted (in dollars per share) | ($0.24) | ($0.14) | ($0.13) | ($0.11) | | ($0.17) | $0.92 | ($0.67) |