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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS (Tables)

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Share-based Payment Arrangement, Activity

The stock-based compensation expense related to stock awards issued under the Plans are presented within the following line items of the condensed consolidated statements of operations for the three and nine months ended September 30, 2021 and 2020 (in thousands):

			Three Months Ended September 30,												Nine Months Ended September 30,
			2021						2020						2021						2020
Cost of revenue			$	137					$	156					$	498					$	496
Marketing			173						377						486						1,218
Selling, general and administrative			7,894						7,846						24,137						29,223
Restructuring and related charges			—						311						—						1,735
Total stock-based compensation expense			$	8,204					$	8,690					$	25,121					$	32,672

Schedule of Restricted Stock Unit Activity

The table below summarizes restricted stock unit activity under the Plans for the nine months ended September 30, 2021:

			Restricted Stock Units						Weighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 2020			1,853,007						$	31.91
Granted			936,875						42.97
Vested			(1,002,467)						29.34
Forfeited			(286,316)						37.54
Unvested at September 30, 2021			1,501,099						$	39.28

Schedule of Performance and Market-based Performance Share Unit Activity

The table below summarizes Performance Share Unit activity under the Plans for the nine months ended September 30, 2021:

			Performance Share Units						Weighted-Average Grant Date Fair Value (per unit)						Market-based Performance Share Units						Weighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 2020			124,709						$	29.73					57,668						$	60.60
Granted (1)			41,729						15.44						—						—
Vested			(86,710)						24.36						—						—
Forfeited			(768)						69.00						—						—
Unvested at September 30, 2021			78,960						27.70						57,668						60.60
Maximum shares issuable upon vesting at September 30, 2021			78,960												57,668

(1)Performance Share Units granted during the nine months ended September 30, 2021 relate to the issuance of incremental shares upon the Compensation Committee's certification of the achievement of the 2020 performance metrics.

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Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares.

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