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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 8,690	$ 19,543	$ 32,672	$ 62,517
Capitalized amount of stock-based compensation	1,100	2,000	3,400	5,500
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	156	405	496	1,163
Marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	377	1,671	1,218	4,586
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	7,846	17,467	29,223	56,768
Restructuring and related charges
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 311	$ 0	$ 1,735	$ 0

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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