INCOME (LOSS) PER SHARE - Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Numerator
Net income (loss) - continuing operations	$ (117,783)	$ 14,522	$ (89,162)	$ (6,396)
Less: Net income (loss) attributable to noncontrolling interests	590	594	1,227	1,982
Net income (loss) attributable to common stockholders - continuing operations	(118,373)	13,928	(90,389)	(8,378)
Net income (loss) attributable to common stockholders - discontinued operations	0	0	(471)	0
Basic net income (loss) attributable to common stockholders	(118,373)	13,928	(90,860)	(8,378)
Plus: Interest expense from assumed conversion of convertible senior notes	0	710	0	0
Net income (loss) attributable to common stockholders plus assumed conversions - continuing operations	$ (118,373)	$ 14,638	$ (90,389)	$ (8,378)
Denominator
Shares used in computation of basic net income (loss) per share (in shares)	40,582,370	39,748,268	40,164,733	38,966,238
Weighted-average effect of diluted securities:
Convertible senior notes due 2026 (in shares)	0	3,376,400	0	0
Shares used in computation of diluted net income (loss) per share (in shares)	40,582,370	45,014,446	40,164,733	38,966,238
Basic net income (loss) per share:
Continuing operations (in usd per share)	$ (2.92)	$ 0.35	$ (2.25)	$ (0.22)
Discontinued operations (in usd per share)	0	0	(0.01)	0
Basic net income (loss) per share (in usd per share)	(2.92)	0.35	(2.26)	(0.22)
Diluted net income (loss) per share:
Continuing operations (in usd per share)	(2.92)	0.33	(2.25)	(0.22)
Discontinued operations (in usd per share)	0	0	(0.01)	0
Diluted net income (loss) attributable to common stockholders - continuing operations	$ (2.92)	$ 0.33	$ (2.26)	$ (0.22)
Stock options
Weighted-average effect of diluted securities:
Dilutive effect of share-based payment arrangements (in shares)	0	1,613,858	0	0
RSUs
Weighted-average effect of diluted securities:
Dilutive effect of share-based payment arrangements (in shares)	0	272,224	0	0
ESPP
Weighted-average effect of diluted securities:
Dilutive effect of share-based payment arrangements (in shares)	0	3,696	0	0

Groupon, Inc. 10-Q