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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 9,738	$ 9,967	$ 16,917	$ 23,982
Capitalized amount of stock-based compensation	1,100	1,200	2,000	2,300
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	190	81	361	340
Marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	178	(33)	313	841
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	9,370	8,495	16,243	21,377
Restructuring and related charges
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 0	$ 1,424	$ 0	$ 1,424

X

- Definition

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

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