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Selected Quarterly Financial Information (unaudited) - Impairments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Future investments
Impairment of equity investments		$ 0	$ 20,973	$ 0
Asset impairment		$ 281	$ 4,020	$ 375,172
Kateeva
Future investments
Impairment of equity investments	$ 21,000
Asset held for sale
Future investments
Asset impairment	$ 4,000

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ 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

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