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Goodwill and intangible assets (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2021

Dec. 31, 2020

Summary of intangible assets

Changes in the carrying amount of intangible assets were as follows:

						March 31, 2021																December 31, 2020
		Useful Lives (in years)				Gross amount				Accum. amort				Net amount				Gross amount				Accum. amort				Net amount
Trademarks			indefinite			$	50,000			$	—			$	50,000			$	50,000			$	—			$	50,000
Customer relationships			4				75,000				(71,875	)			3,125				75,000				(67,187	)			7,813
Purchased technology			5				45,423				(35,314	)			10,109				45,423				(33,149	)			12,274
Development costs			3				9,486				(8,884	)			602				9,486				(8,434	)			1,052
Software			4				2,406				(2,308	)			98				2,406				(2,181	)			225
Total						$	182,315			$	(118,381	)		$	63,934			$	182,315			$	(110,951	)		$	71,364

The components of our other intangible assets were as follows (in thousands):

						December 31, 2020												December 31, 2019
		Useful Lives				Gross Amount				Accum. Amort				Net Amount				Gross Amount				Accum. Amort				Net Amount
Trademarks			indefinite			$	50,000			$	—			$	50,000			$	50,000			$	—			$	50,000
Customer relationships			4 years				75,000				(67,187	)			7,813				75,000				(48,437	)			26,563
Purchased technology			5 years				45,423				(33,149	)			12,274				45,423				(24,487	)			20,936
Development costs			3 years				9,486				(8,434	)			1,052				9,486				(5,096	)			4,390
Software			4 years				2,406				(2,181	)			225				2,400				(1,592	)			808
Total						$	182,315			$	(110,951	)		$	71,364			$	182,309			$	(79,612	)		$	102,697

Summary of estimated amortization expense

Estimated amortization expense for the years ending December 31, 2021 through 2025 is as follows (in thousands):

Year		Expense
2021		$	17,735
2022			3,629
2023			0
2024			0
2025			0

Summary of amortization expense

The following reflects amortization expense related to intangible assets included with depreciation and amortization:

		Three months ended March 31,
		2021				2020
Amortization expense		$	7.4 million			$	7.9 million

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-Name Accounting Standards Codification
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