ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	May 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Purchase price adjustments to current assets		$ 2,300
Consideration, net of cash acquired		20,372	$ 112,399	$ 1,915
Weebly, Inc
Business Acquisition [Line Items]
Percent acquired of outstanding shares	100.00%
Cash consideration	$ 132,432
Equity consideration (in shares)	2,418,271
Equity consideration fair value	$ 140,107
Amount paid to pay outstanding and unvested options	17,700
Post combination compensation expense	$ 2,600
Purchase price adjustment to goodwill		3,700
Purchase price adjustment to liabilities assumed		4,700
Cash withheld as security for indemnification obligations		$ 500
Shares of the total share consideration remaining withheld for indemnification purposes (in shares)		8,873
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Consideration, net of cash acquired		$ 20,400	$ 9,900	$ 1,900