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Financial Instruments - Disclosure of fair value measurement and classification (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | $ 575,738 | $ 944,832 |  |
Financial liabilities | 35,664 | 192,808 |  |
Carrying Amount |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 575,738 | 944,832 |  |
Financial liabilities | 35,664 | 192,808 |  |
Subsidiary warrant liability |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 47 | 6,787 |  |
Subsidiary warrant liability | Carrying Amount |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 47 | 6,787 |  |
Subsidiary preferred shares |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 27,339 | 174,017 |  |
Subsidiary preferred shares | Carrying Amount |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 27,339 | 174,017 |  |
Subsidiary notes payable |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 2,345 | 4,641 |  |
Subsidiary notes payable | Carrying Amount |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 2,345 | 4,641 |  |
Share based liability awards |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 5,932 | 7,362 |  |
Share based liability awards | Carrying Amount |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 5,932 | 7,362 |  |
Level 1 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 534,777 | 687,005 |  |
Financial liabilities | 4,396 | 6,081 |  |
Level 1 of fair value hierarchy | Subsidiary warrant liability |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 1 of fair value hierarchy | Subsidiary preferred shares |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 1 of fair value hierarchy | Subsidiary notes payable |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 1 of fair value hierarchy | Share based liability awards |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 4,396 | 6,081 |  |
Level 2 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 11,867 | 3,174 |  |
Financial liabilities | 2,097 | 1,945 |  |
Level 2 of fair value hierarchy | Subsidiary warrant liability |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 2 of fair value hierarchy | Subsidiary preferred shares |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 2 of fair value hierarchy | Subsidiary notes payable |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 2,097 | 1,945 |  |
Level 2 of fair value hierarchy | Share based liability awards |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 3 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 29,094 | 254,653 |  |
Financial liabilities | 29,171 | 184,781 |  |
Level 3 of fair value hierarchy | Subsidiary warrant liability |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 47 | 6,787 | $ 8,206 | $ 7,997
Level 3 of fair value hierarchy | Subsidiary preferred shares |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 27,339 | 174,017 |  |
Level 3 of fair value hierarchy | Subsidiary notes payable |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 248 | 2,696 |  |
Level 3 of fair value hierarchy | Share based liability awards |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial liabilities | 1,537 | 1,281 |  |
Money Markets |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 95,249 | 432,649 |  |
Money Markets | Carrying Amount |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 95,249 | 432,649 |  |
Money Markets | Level 1 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 95,249 | 432,649 |  |
Money Markets | Level 2 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 0 | 0 |  |
Money Markets | Level 3 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 0 | 0 |  |
Short-term Investments |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 200,229 |  |  |
Short-term Investments | Carrying Amount |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 200,229 |  |  |
Short-term Investments | Level 1 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 200,229 |  |  |
Short-term Investments | Level 2 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 0 |  |  |
Short-term Investments | Level 3 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 0 |  |  |
Short-term note from associate |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 16,501 | 15,120 |  |
Short-term note from associate | Carrying Amount |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 16,501 | 15,120 |  |
Short-term note from associate | Level 1 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 0 | 0 |  |
Short-term note from associate | Level 2 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 0 | 0 |  |
Short-term note from associate | Level 3 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 16,501 | 15,120 |  |
Investments held at fair value |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 251,892 | 493,888 |  |
Investments held at fair value | Carrying Amount |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 251,892 | 493,888 |  |
Investments held at fair value | Level 1 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 239,299 | 254,355 |  |
Investments held at fair value | Level 2 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 0 | 0 |  |
Investments held at fair value | Level 3 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 12,593 | 239,533 | $ 206,892 | $ 154,445
Trade and other receivables |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 11,867 | 3,174 |  |
Trade and other receivables | Carrying Amount |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 11,867 | 3,174 |  |
Trade and other receivables | Level 1 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 0 | 0 |  |
Trade and other receivables | Level 2 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | 11,867 | 3,174 |  |
Trade and other receivables | Level 3 of fair value hierarchy |  |  |  |
Financial Instruments - Fair value Measurement and Classification [Line Items] |  |  |  |
Financial assets | $ 0 | $ 0 |  |

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