| In millions, except per share items | Jun-30-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| REVENUE- DIGITAL ASSET SALES | | | | | 0.0 | 4.4 | | |
| REVENUE- DIGITAL ASSET SALES growth | | -100.0% | | | | | | |
| OPERATING EXPENSES- | | | | | | | | |
| RESEARCH AND DEVELOPMENT EXPENSES | 1.9 | 1.7 | 2.0 | 1.3 | 1.2 | 0.9 | 0.9 | 0.9 |
| SELLING, GENERAL AND ADMINISTRATIVE EXPENSES | 1.4 | 1.9 | 3.9 | 1.8 | 1.6 | 4.3 | 1.5 | 1.0 |
| SELLING AND TRANSACTIONAL COSTS FOR DIGITAL ASSETS | | | 0.0 | 0.2 | 0.2 | 3.1 | | |
| Total operating expenses | 3.2 | 7.3 | 5.8 | 3.0 | 2.9 | 5.2 | 2.4 | 1.9 |
| OPERATING LOSS | -3.2 | -3.6 | -5.8 | -3.0 | -2.8 | -0.9 | -2.4 | -1.9 |
| Operating margin | | | | | -32724.2% | -20.0% | | |
| |
| OTHER (EXPENSE): | | | | | | | | |
| Interest income (expense), net | 0.0 | -0.2 | 0.0 | -0.2 | -3.3 | -4.5 | -5.2 | -5.2 |
| Other (expense) income | -0.4 | 0.1 | 0.3 | 0.3 | | | | |
| Total other (expense), net | 0.4 | -0.1 | -0.3 | -0.3 | | | | |
| LOSS BEFORE INCOME TAXES | -3.6 | -3.8 | -20.1 | -3.0 | | -5.4 | -25.4 | |
| NET LOSS | -3.6 | -3.8 | -5.6 | -3.0 | -6.1 | -5.4 | -7.6 | -7.1 |
| Common stock dividends on Series D Preferred Stock | -1.6 | | | | | | | |
| Deemed dividends on Series C and D Preferred Stock | -3.3 | | | | | | | |
| NET LOSS AVAILABLE TO COMMON SHAREHOLDERS | -8.6 | | | -3.0 | | | | |
| |
| Basic and diluted loss per share | ($0.18) | ($0.08) | ($0.13) | ($0.07) | ($0.16) | ($0.15) | ($0.22) | ($0.23) |
| |
| Weighted average shares of common stock outstanding- basic and diluted | 48.9 | 48.2 | 40.4 | 43.8 | 37.9 | 35.5 | 29.4 | 31.1 |