OTHER CONSOLIDATED BALANCE SHEET COMPONENTS (CURRENT) - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued expenses	$ 126,911	$ 128,387
Accrued transaction losses	96,661	34,771
Accounts payable	29,831	42,116
Deferred revenue, current	40,392	38,104
Square Payroll payable	29,618	27,969
Other	69,321	26,494
Total	$ 392,734	$ 297,841