In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| 10-K | 10-K | 20-F | 20-F | 10-K | 10-K | 10-K | 20-F |
Operating activities: | | | | | | | | |
Net loss | | | -5.8 | -4.3 | -26.2 | -26.2 | -68.5 | -47.2 |
Adjustments to reconcile net loss to cash used in operating activities: | | | | | | | | |
Depreciation and amortization | 28.3 | 5.7 | 1.0 | 1.0 | 3.9 | 6.1 | 6.2 | 7.5 |
Share-based compensation | 8.5 | 0.4 | 0.0 | 0.6 | 1.6 | 7.8 | 9.1 | 7.2 |
LDA cost | | 0.5 | 0.5 | | 1.5 | 2.2 | 1.5 | 0.7 |
Change in fair value of warrant liabilities | 2.6 | 2.8 | | | -0.3 | -2.2 | -1.2 | -0.5 |
Realized gain on sale of digital assets | 0.0 | | | | | | | |
Impairment of digital assets | | | 0.3 | 0.1 | | 2.5 | | |
Impairment of investments | 89.1 | 0.8 | 0.3 | 0.1 | | 2.5 | 34.4 | 10.7 |
Issuance of common shares and warrants for settlement of liabilities | 2.6 | 2.8 | | | -0.3 | -2.2 | -1.2 | -0.5 |
Changes in operating assets and liabilities: | | | | | | | | |
Accounts receivable | 0.0 | 0.1 | 0.1 | 0.8 | 2.9 | 1.4 | -1.2 | -1.5 |
Accounts payable and accrued liabilities | 1.7 | 3.8 | 3.5 | 0.5 | 6.1 | 2.2 | 0.7 | 0.8 |
Accrued payroll and employee compensation | 0.5 | -0.1 | -0.1 | 0.2 | -0.9 | 0.8 | -0.4 | -1.2 |
Other assets and liabilities, net | | | -1.0 | 0.7 | -1.9 | -3.0 | 0.1 | 1.2 |
Net cash used in operating activities | -30.8 | -28.5 | -2.6 | -1.8 | -7.6 | -9.0 | -17.5 | -23.2 |
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Investing activities: | | | | | | | | |
Payments for purchase of property and equipment | -17.6 | -102.2 | | | -0.1 | -0.1 | -0.2 | -0.4 |
Purchase of intangible assets | -0.3 | | | | | | | -0.1 |
Net cash provided by (used in) investing activities | -22.0 | -122.7 | -2.0 | | 0.9 | -1.2 | -0.2 | -0.6 |
|
Financing activities: | | | | | | | | |
Proceeds from exercise of stock options | | 0.3 | 0.1 | | | | | 0.2 |
Net cash provided by financing activities | | 205.1 | 4.9 | 1.6 | 2.4 | 9.5 | 14.1 | 28.3 |
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Reconciliation of cash, cash equivalents and restricted cash to consolidated balance sheets: | | | | | | | | |
Cash and cash equivalents | | | | | | | | |
Restricted cash | | | | | | | | |
Supplemental disclosures of non-cash investing activities: | | | | | | | | |
Remeasurement of redeemable non-controlling interest | | | | | | | | |
Reclassification from deposit for mining equipment to mining equipment | | | | | | | | |
Issuance of common shares for purchase of intangible assets | | | | | | | | |