| In millions, except per share items | Jun-30-23 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 |
| | 10-Q | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
| Cash flows from operating activities: | | | | | | | | |
| Net loss | -64.3 | -8.0 | -26.1 | -28.8 | -25.4 | -42.8 | 41.1 | 3.1 |
| Adjustments to reconcile net loss to net cash provided by operating activities: | | | | | | | | |
| Depreciation and amortization | | 4.8 | 4.0 | 2.6 | 1.5 | 0.6 | 0.8 | 0.3 |
| Amortization of right-of-use assets | | | 0.5 | | | | | |
| Stock-based compensation | 2.1 | 2.0 | 1.0 | 2.7 | 3.0 | 4.1 | 0.6 | 0.0 |
| Impairment of cryptocurrencies | | 0.5 | 2.0 | 0.4 | | | | |
| Realized losses on sale of marketable securities | | -0.6 | -24.3 | 5.7 | -6.0 | -2.9 | -7.4 | -4.9 |
| Unrealized gains on equity securities | | | | | | | | |
| Income from cash held in trust | | | | | | | | |
| Loss from investment in unconsolidated entity | | | | | | | | |
| Loss on remeasurement of investment in unconsolidated entity | | | | | | | | |
| Provision for loan losses | | | | | | | | |
| Change in the fair value of warrant liability | | | | | | | | |
| Changes in operating assets and liabilities: | | | | | | | | |
| Marketable equity securities | | | | | | | | |
| Accounts receivable | | -0.7 | -1.7 | -0.6 | -0.1 | -0.4 | -1.2 | 0.3 |
| Inventories | | -3.2 | -0.9 | -1.7 | -1.5 | -1.0 | 0.6 | -0.1 |
| Prepaid expenses and other current assets | | -0.6 | -5.0 | 7.4 | -0.4 | -2.6 | -2.4 | -0.1 |
| Other assets | | -2.6 | 0.3 | -0.7 | -1.1 | -0.2 | -0.2 | -0.1 |
| Net cash provided by operating activities | -24.7 | -2.1 | -5.6 | 25.0 | -4.8 | -35.2 | -7.5 | -14.2 |
| |
| Cash flows from investing activities: | | | | | | | | |
| Purchase of property and equipment | | -11.7 | -37.4 | -35.4 | -123.8 | -22.6 | -1.2 | -4.3 |
| Investment in promissory notes and other, related parties | | | -1.5 | -0.7 | | -1.0 | -0.4 | -3.6 |
| Purchase of SMC, net of cash received | | | -8.2 | | | | | |
| Cash received upon acquisition of AVLP | | | 1.2 | | | | | |
| Purchase of marketable equity securities | | | -1.8 | -0.2 | -0.6 | -2.1 | | |
| Sales of marketable equity securities | | 0.0 | 1.5 | 10.2 | 3.6 | | | 0.4 |
| Principal payments on loans receivable | | | 9.0 | 1.5 | | | | |
| Investments in equity securities | | -6.6 | -12.0 | -3.8 | -17.6 | -10.2 | -2.3 | -1.8 |
| Proceeds from the sale of fixed assets | | | | | | | | |
| Net cash used in investing activities | | -23.6 | -62.7 | -24.4 | -264.7 | -39.0 | -13.0 | -16.7 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Proceeds from sales of preferred stock | | 0.2 | 3.7 | | | | | |
| Financing cost in connection with sales of preferred stock | | -0.1 | 2.2 | -2.8 | -1.0 | -0.4 | -0.5 | -4.1 |
| Payments on notes payable | | -1.7 | 0.0 | -66.0 | -0.2 | -0.3 | -0.9 | -1.0 |
| Payments of preferred dividends | | -0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Purchase of treasury stock | 0.5 | -8.1 | -6.5 | -1.0 | -10.4 | -2.8 | | |
| Net cash provided by financing activities | 0.5 | 10.6 | 53.3 | 22.2 | 246.9 | 13.0 | 18.1 | 119.9 |
| |
| Supplemental disclosures of cash flow information: | | | | | | | | |
| Cash paid during the period for interest | | 1.1 | 1.5 | 2.6 | -0.5 | 0.1 | | 0.7 |
| Non-cash investing and financing activities: | | | | | | | | |
| Settlement of accounts payable with digital currency | | 0.0 | 0.4 | | | | 0.1 | |
| Conversion of investment in unconsolidated entity for acquisition of AVLP | | -2.7 | 23.4 | | | | | |
| Conversion of debt and equity securities to marketable securities | | 15.5 | 24.8 | | | | 2.7 | |
| Conversion of loans receivable to marketable securities | | 0.1 | 3.6 | | | | | |
| Conversion of interest receivable to marketable securities | | 0.0 | 0.2 | | | | | |