Intangible Assets

9 Months Ended

Sep. 30, 2021

Intangible Assets Disclosure [Abstract]

Intangible Assets

3. Intangible Assets

The details of intangible assets and related accumulated amortization are set forth below:

	As of September 30, 2021						As of December 31, 2020
	Gross value		Accumulated amortization		Net value		Gross value		Accumulated amortization		Net value
Publisher and data supply relationships	$	7,500	$	1,146	$	6,354	$	—	$	—	$	—
Tradenames		2,720		2,040		680		2,720		1,634		1,086
Completed technologies		20,292		16,352		3,940		20,292		13,037		7,255
Customer relationships		52,159		34,201		17,958		45,239		24,989		20,250
Total intangible assets	$	82,671	$	53,739	$	28,932	$	68,251	$	39,660	$	28,591

Amortization expense was $5,051 and $14,079 for the three and nine months ended September 30, 2021, respectively, and $3,913 and $11,754 for the three and nine months ended September 30, 2020, respectively.

Weighted average useful life of the unamortized intangibles as of September 30, 2021 was 2.10 years. Based on the amount of intangible assets subject to amortization, as of September 30, 2021, the Company’s estimated future amortization expense over the next five years and beyond are as follows:

Total estimated future amortization expense is as follows:

	As of September 30, 2021
Year ended December 31,
Remaining three months of 2021	$	4,952
2022		15,332
2023		6,040
2024		2,002
2025		482
2026 and thereafter		124
Total	$	28,932