Goodwill is recorded when the purchase price of an acquisition exceeds the fair value of the net tangible and identified intangible assets acquired.

The following table represents the changes to goodwill during the six months ended June 30, 2021 (in thousands):


	Carrying Amount
Balance as of December 31, 2020	$	59,568
Addition from acquisition	—
Balance as of June 30, 2021	$	59,568

To date, the Company has zero accumulated impairment loss on goodwill.

Intangible assets are carried at cost less accumulated amortization.

The following tables present details of the Company’s intangible assets as of June 30, 2021 and December 31, 2020 (in thousands, except for weighted average data):


	As of June 30, 2021
	Gross Carrying Amount		Accumulated Amortization	Net Carrying Amount		Weighted Average Remaining Useful Life (in Years)
Intangible assets with finite lives
Developed Technology	$	42,959	(5,454)	$	37,505	4.4
Total Intangible Assets	$	42,959	(5,454)	$	37,505


	As of December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Remaining Useful Life (in Years)
Intangible assets with finite lives
Developed Technology	$	42,959	$	(1,206)	$	41,753	4.9
Total Intangible Assets	$	42,959	$	(1,206)	$	41,753

The above does not include $0.6 million each of indefinite lived intangible assets as of June 30, 2021 and December 31, 2020.

Amortization expenses are recorded to the appropriate expense categories. Amortization expense was $2.1 million and $4.2 million for the three and six months ended June 30, 2021, respectively and was immaterial for each of the three and six months ended June 30, 2020.

The expected future amortization expenses related to the intangible assets as of June 30, 2021 were as follows (in thousands):