GOODWILL AND INTANGIBLE ASSETS, NET (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill by reportable segment was as follows:


	North America		Europe		Russia		Total
Balance as of January 1, 2019	$	103,542	$	63,290	$	—	$	166,832
test IO acquisition (Note 2)	3,301		8,849		—		12,150
Other 2019 Acquisitions (Note 2)	6,503		9,546		738		16,787
Think purchase accounting adjustments	—		(2,043)		—		(2,043)
Effect of net foreign currency exchange rate changes	80		1,231		6		1,317
Balance as of December 31, 2019	113,426		80,873		744		195,043
test IO purchase accounting adjustment	863		(1,089)		—		(226)
Other 2019 acquisitions purchase accounting adjustments	219		259		21		499
2020 Acquisitions (Note 2)	6,042		6,903		—		12,945
Effect of net foreign currency exchange rate changes	582		3,160		(47)		3,695
Balance as of December 31, 2020	$	121,132	$	90,106	$	718	$	211,956

Components of Intangible Assets

Intangible assets other than goodwill as of December 31, 2020 and 2019 were as follows:


	As of December 31, 2020
	Weighted average life at acquisition (in years)	Gross carrying amount		Accumulated amortization		Net carrying amount
Customer relationships	9	$	94,169	$	(49,415)	$	44,754
Software	6	6,309		(1,633)		4,676
Trade names	5	6,495		(5,273)		1,222
Contract royalties	8	1,900		(673)		1,227
Assembled workforce	3	157		(61)		96
Total		$	109,030	$	(57,055)	$	51,975


	As of December 31, 2019
	Weighted average life at acquisition (in years)	Gross carrying amount		Accumulated amortization		Net carrying amount
Customer relationships	9	$	87,489	$	(38,526)	$	48,963
Software	6	4,472		(486)		3,986
Trade names	5	6,439		(4,753)		1,686
Contract royalties	8	1,900		(435)		1,465
Assembled workforce	3	158		—		158
Total		$	100,458	$	(44,200)	$	56,258

Intangible Assets Amortization Expense Recognized

The following table presents amortization expense recognized for the periods indicated:


	For the Years Ended December 31,
	2020		2019		2018
Customer relationships	$	10,478	$	8,743	$	7,637
Software	1,068		486		—
Trade names	495		447		266
Contract royalties	238		238		198
Assembled workforce	61		—		—
Favorable lease	—		—		410
Total	$	12,340	$	9,914	$	8,511

Estimated Amortization Expense

Based on the carrying value of the Company’s existing intangible assets as of December 31, 2020, the estimated amortization expense for the future years is as follows:


Year ending December 31,	Amount
2021	$	12,585
2022	12,426
2023	11,115
2024	8,586
2025	5,543
Thereafter	1,720
Total	$	51,975