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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 9,967	$ 26,563	$ 23,982	$ 42,974
Capitalized amount of stock-based compensation	1,200	2,200	2,300	3,500
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	81	380	340	758
Marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	(33)	1,490	841	2,915
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	8,495	24,693	21,377	39,301
Restructuring and related charges
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,424	$ 0	$ 1,424	$ 0

X

- Definition

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

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