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

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Amount of cost for defined contribution plan.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Percentage employer matches of the employee's percentage contribution matched.

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Amount of cost capitalized for award under share-based payment arrangement.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares under non-option equity instrument agreements for which rights to exercise lapsed.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Aggregate value of stock related to Restricted Stock Awards issued during the period.

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COMPENSATION ARRANGEMENTS - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Apr. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 30,006	$ 33,169	$ 40,745
Share-based payment arrangement, amount capitalized	$ 3,400	3,700	4,500
Number of shares available for grant (in shares)	100,500,000
United States
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined contribution plan, employer matching contribution, percent of match	50.00%
Defined contribution plan, employer matching contribution, percent of employees' eligible compensation	6.00%
Defined contribution plan, vesting period	3 years
Defined contribution plan, cost	$ 5,800	$ 6,700	$ 6,600
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)	83,551	49,399	69,371
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period, weighted average grant date fair value (in usd per shares)	$ 16.95	$ 31.48	$ 24.92
Fair value of restricted stock award vested	$ 15,600	$ 48,800	$ 19,200
Unrecognized compensation costs, amount	$ 39,300
Unrecognized compensation costs, period for recognition	1 year
Forfeited (in shares)	969,255
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number (in shares)	2,876,089	2,205,235
Restricted stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Restricted stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period, weighted average grant date fair value (in usd per shares)	$ 0
Forfeited (in shares)	0
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number (in shares)	17,269	37,763
Market-based Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeited (in shares)	24,335
Expired (in shares)	33,333
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number (in shares)	0
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 395	$ 585	662
Marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	1,054	748	1,522
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	28,557	31,836	36,826
Restructuring and related charges
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 0	$ 0	$ 1,735
2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for awards (in shares)				11,875,000
Number of shares available for future issuance (in shares)	3,266,298