OTHER CONSOLIDATED BALANCE SHEET COMPONENTS (CURRENT) - Schedule of Reserve for Transaction Losses (Details) - Transaction Losses - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Loss Contingency Accrual [Roll Forward]
Accrued transaction losses, beginning of the period	$ 34,771	$ 33,682
Provision for transaction losses	79,303	19,808
Charge-offs to accrued transaction losses	(17,413)	(17,443)
Accrued transaction losses, end of the period	$ 96,661	$ 36,047