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Intangible Assets, net

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets, net, consisted of the following (in thousands):


	As of December 31, 2021
	Remaining Weighted average useful life (in years)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships	5.7	$	19,163	$	8,470	$	10,693
Developed technology	4.8	10,605		5,487		5,118
Trade names	2.3	520		300		220
Total intangible assets		$	30,288	$	14,257	$	16,031


	As of December 31, 2020
	Remaining Weighted average useful life (in years)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships	2.5	$	8,626	$	7,949	$	677
Developed technology	0.2	5,216		5,085		131
Trade names	0.2	288		281		7
Total intangible assets		$	14,130	$	13,315	$	815

As discussed in Note 4, we acquired Earth Class Mail in November 2021 and Pure in October 2020. In 2021, 2020 and 2019, we recorded amortization expense of $1.0 million, $2.8 million and $4.3 million, respectively.

At December 31, 2021, estimated future intangible assets amortization expense were as follows (in thousands):


For Years Ending December 31,
2022	$	3,162
2023	3,006
2024	2,869
2025	2,851
2026	2,670
Thereafter	$	1,473
Total future amortization expense	$	16,031