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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Variable Interest Entity [Line Items]
Interest income	$ 15,900	$ 8,100	$ 42,800	$ 20,200
Unrealized gain (loss)	(5,066)	(115)	24,181	126,444
Net foreign currency exchange gains		800		2,900
Realized loss			(8,200)
Mark-to-market charge			1,300
Realized gain	(8)	$ 702	2,136	27,874
Pinterest
Variable Interest Entity [Line Items]
Unrealized reduction to estimated fair value of warrant	8,700
Unrealized gain (loss)	$ 4,600		25,300	128,800
Realized gain				$ 26,800
Warrant
Variable Interest Entity [Line Items]
Unrealized gain (loss)			$ (8,700)

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