| In millions, except per share items | Jun-30-23 | Mar-31-23 | Jun-30-22 | Mar-31-22 | Dec-31-20 | Sep-30-20 | Jun-30-20 | Mar-31-20 |
| | 10-Q | 10-Q | 10-Q | 10-Q | 20-F | 10-Q | 10-Q | 10-Q |
| Revenue | 5.5 | 3.0 | 1.9 | 1.4 | 2.1 | 0.9 | 0.9 | 1.0 |
| Revenue growth | 184.5% | 120.6% | | | 84.0% | -34.9% | -7.5% | -52.6% |
| Cost of revenue | | | | | | | | |
| Sales and marketing | 0.3 | 0.3 | 0.3 | 0.2 | 0.4 | 0.3 | 0.2 | 0.3 |
| Research and development | 0.2 | 0.3 | 0.1 | 0.1 | 0.3 | 0.3 | 0.3 | 0.3 |
| General and administrative | 3.6 | 3.5 | 7.8 | 9.0 | 1.1 | 1.6 | 1.8 | 1.0 |
| Depreciation and amortization | 1.4 | 1.0 | 7.5 | 6.4 | | | | |
| Loss on disposal of property and equipment | 0.3 | | | | | | | |
| Realized gain on sale of digital assets | -0.1 | -0.6 | | 0.0 | | | | |
| Impairment of digital assets | 0.3 | 0.1 | 0.7 | 0.1 | | | | |
| Total operating expenses | 10.2 | 6.8 | 17.3 | 16.5 | 2.0 | 2.2 | 2.4 | 1.6 |
| Loss from operations | -4.7 | -3.7 | -15.4 | -15.1 | -1.2 | -1.7 | -2.0 | -1.2 |
| Operating margin | -85.9% | -123.6% | -801.4% | -1101.2% | -57.3% | -186.1% | -220.7% | -115.2% |
| |
| Other income (expense): | | | | | | | | |
| Interest expense | -1.2 | | | | -0.1 | -0.1 | -0.1 | 0.0 |
| Interest income and other, net | 1.1 | 0.3 | 0.3 | 0.5 | -0.1 | 0.7 | 0.2 | 0.1 |
| Forgiveness of note receivable | | | -13.1 | | | | | |
| Impairment of investments | 0.3 | 0.1 | 0.7 | 0.1 | | | | |
| Net loss | -4.8 | -3.5 | -40.7 | -14.6 | -1.5 | -1.2 | -1.9 | |
| Provision for income taxes | 0.0 | | | | 0.0 | 0.0 | 0.0 | |
| Net loss | -4.8 | -3.5 | -40.7 | -14.6 | -1.5 | -1.2 | -1.9 | -1.1 |
| Less: Non-controlling interest - income | -0.1 | 0.0 | | | | | | |
| Net Income (Loss) Available to Common Stockholders, Basic | -4.8 | -3.5 | -40.7 | -14.6 | -1.5 | -1.2 | -1.9 | -1.1 |
| |
| Net loss per share: | | | | | | | | |
| Net loss per share, basic (in USD per share) | ($0.44) | ($0.05) | ($4.31) | ($0.23) | ($0.98) | | | |
| Net loss per share, diluted (in USD per share) | ($0.44) | ($0.05) | ($4.31) | ($0.23) | ($0.98) | | | |
| |
| Weighted Average Number of Shares Outstanding, Diluted [Abstract] | | | | | | | | |
| Basic (in shares) | 11.1 | 72.0 | 9.4 | 63.8 | 5.9 | 6.9 | 4.8 | 3.9 |
| Diluted (in shares) | 11.1 | 72.0 | 9.4 | 63.8 | 5.9 | 6.9 | 4.8 | 3.9 |