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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS
3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS
Restricted Stock Units
The restricted stock units granted under the Groupon, Inc. Stock Plans (the "Plans") generally have vesting periods between one and four years and are amortized on a straight-line basis over their requisite service period.
The table below summarizes restricted stock unit activity under the Plans for the three months ended March 31, 2022:
Restricted Stock UnitsWeighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 20212,205,235 $31.06 
Granted172,072 30.34 
Vested(287,658)27.84 
Forfeited(73,686)38.81 
Unvested at March 31, 20222,015,963 $31.10 
As of March 31, 2022, $44.0 million of unrecognized compensation costs related to unvested restricted stock units are expected to be recognized over a remaining weighted-average period of 1.1 years.
Performance Share Units
We have previously granted performance share units under the Plans that vest in shares of our common stock upon the achievement of financial and operational targets specified in the respective award agreement ("Performance Share Units"). We have also granted performance share units subject to a market condition ("Market-based Performance Share Units"). Our existing Performance Share Units and Market-based Performance Share Units are subject to continued employment through the performance period dictated by the award and certification by the Compensation Committee of the Board that the specified performance conditions have been achieved.
During the three months ended March 31, 2022, 20,494 shares of our common stock were issued upon vesting of Performance Share Units granted in 2020 and prior based on the Board's certification of our financial and operational metrics for the year ended December 31, 2021. The weighted average grant date fair value of those shares was $31.97 per share. As of March 31, 2022, we have recognized substantially all expense related to the 17,269 unvested Performance Share Units and the 33,333 unvested Market-based Performance Share Units