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Summary of Significant Accounting Policies - Financial Instruments Measured at Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021
--- | --- | --- | ---
Liabilities: |  |  |
Warrant liability | $ 1,136 | $ 3,605 | $ 3,263
Fair Value, Recurring |  |  |
Assets: |  |  |
Digital assets | 12,592 | 32,581 |
Total | 12,592 | 32,581 |
Liabilities: |  |  |
Warrant liability | 1,136 | 3,605 |
Total | 1,136 | 3,605 |
Level 1 | Fair Value, Recurring |  |  |
Assets: |  |  |
Digital assets | 12,592 | 32,581 |
Total | 12,592 | 32,581 |
Liabilities: |  |  |
Warrant liability | 0 | 0 |
Total | 0 | 0 |
Level 2 | Fair Value, Recurring |  |  |
Assets: |  |  |
Digital assets | 0 | 0 |
Total | 0 | 0 |
Liabilities: |  |  |
Warrant liability | 1,136 | 3,605 |
Total | 1,136 | 3,605 |
Level 3 | Fair Value, Recurring |  |  |
Assets: |  |  |
Digital assets | 0 | 0 |
Total | 0 | 0 |
Liabilities: |  |  |
Warrant liability | 0 | 0 |
Total | $ 0 | $ 0 |

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- Definition Fair value portion of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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