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Other Investments (Details) - Equity Securities $ in Thousands |  | 6 Months Ended
--- | --- | ---
Mar. 04, 2019 shares | Jun. 30, 2020 d milestone shares | Jun. 30, 2019 USD ($) shares
Whistler |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Number of milestones remaining | milestone |  | 1 |
Number of shares sold (in shares) | 2,563 |  |
Shares sold, percentage of shares issued and outstanding | 19.00% |  |
Aurora |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Shares received (in shares) | 2,524,341 | 578,101 |
Proceeds from sale of equity securities, FV-NI | $ |  |  | $ 19,259
Stock issued during period, new issues, measurement input | d |  | 5 |
Number of shares sold (in shares) |  |  | 2,524,341
Canopy |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Proceeds from sale of equity securities, FV-NI | $ |  |  | $ 355
Number of shares sold (in shares) |  |  | 11,062

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