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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%

X

- Definition

Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117539-209714

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+ References

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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

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- Definition

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+ References

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