OTHER CONSOLIDATED BALANCE SHEET COMPONENTS (CURRENT) - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued expenses	$ 128,387	$ 82,354
Accrued transaction losses	34,771	33,682
Accounts payable	42,116	36,416
Deferred revenue, current	38,104	31,474
Square Payroll payable	27,969	7,534
Other	26,494	23,729
Total	$ 297,841	$ 215,189