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COMPENSATION ARRANGEMENTS - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 30, 2019	Apr. 30, 2010	Jan. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)	100,500,000	100,500,000
Number of shares available for future issuance (in shares)	3,135,422
Total stock-based compensation expense	$ 40,745	$ 81,615	$ 64,821
Share-based payment arrangement, amount capitalized	$ 4,500	7,100	7,400
Number of shares available for grant (in shares)	100,500,000
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 662	1,482	1,485
Marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	1,522	5,809	6,948
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	36,826	74,324	56,288
Restructuring and related charges
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	1,735	0	0
Other income (expense), net
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 0	$ 0	$ 100
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	1,000,000
Shares issued under employee stock purchase plan (in shares)	69,371	74,300	81,053
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value (in usd per shares)	$ 24.92	$ 68.80	$ 91.80
Stock issued during period, value, restricted stock award, gross	$ 19,200	$ 43,800	$ 64,100
Share-based payment arrangement, nonvested award, cost not yet recognized, amount	$ 38,800
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition	11 months 1 day
Market-based Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value (in usd per shares)	$ 0
Criteria for contingently issuable shares (in usd per share)	$ 120.00
Share-based compensation arrangement by share-based payment award, fair value assumptions, weighted average volatility rate	49.80%
Share-based compensation arrangement by share-based payment award, fair value assumptions, cost of equity rate	12.80%
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value (in usd per shares)	$ 15.44
Share-based payment arrangement, nonvested award, cost not yet recognized, amount	$ 1,300
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition	1 year 6 months 14 days
Minimum | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	1 year
Maximum | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	4 years
2008 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)						3,230,925
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)					1,000,000
2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)				9,375,000

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