ACQUISITIONS - Narrative (Details) - Developed technology	Oct. 29, 2018	Apr. 12, 2018
MarianaIQ
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, estimated useful life		2 years
Finite-lived intangible assets, amortization period		2 years
Jitsi
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, estimated useful life	2 years
Finite-lived intangible assets, amortization period	2 years