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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 8,204	$ 8,690	$ 25,121	$ 32,672
Capitalized amount of stock-based compensation	900	1,100	2,900	3,400
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	137	156	498	496
Marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	173	377	486	1,218
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	7,894	7,846	24,137	29,223
Restructuring and related charges
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 0	$ 311	$ 0	$ 1,735

X

- Definition

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

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