PROPERTY AND EQUIPMENT - Schedule of Depreciation and Amortization Expense Associated with Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Property Plant And Equipment [Line Items]
Total depreciation expense	$ 4,420	$ 3,529
Property and equipment
Property Plant And Equipment [Line Items]
Total depreciation expense	4,039	3,141
Property and equipment | Cost of revenue
Property Plant And Equipment [Line Items]
Total depreciation expense	3,303	2,402
Property and equipment | Sales and marketing
Property Plant And Equipment [Line Items]
Total depreciation expense	107	184
Property and equipment | Research and development
Property Plant And Equipment [Line Items]
Total depreciation expense	68	2
Property and equipment | General and administrative
Property Plant And Equipment [Line Items]
Total depreciation expense	$ 561	$ 553