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Investments - Other Investment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Investment |  |  |  |  |
Impairment of equity investments |  |  | $ 0 | $ 20,973 | $ 0
Kateeva |  |  |  |  |
Other Investment |  |  |  |  |
Impairment of equity investments |  | $ 21,000 |  |  |
Kateeva | Other income (expense), net |  |  |  |  |
Other Investment |  |  |  |  |
Impairment of equity investments | $ 21,000 |  |  |  |
Kateeva | Maximum |  |  |  |  |
Other Investment |  |  |  |  |
Percentage ownership of cost method investee | 20.00% |  | 20.00% |  |
Separate non-marketable investment |  |  |  |  |
Other Investment |  |  |  |  |
Carrying value of investment | $ 3,000 |  | $ 3,000 |  |
Separate non-marketable investment | Maximum |  |  |  |  |
Other Investment |  |  |  |  |
Percentage ownership of cost method investee | 20.00% |  | 20.00% |  |

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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=121553693&loc=SL6284422-111562 + Details
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