The carrying amount of goodwill was $512.9 million and $462.3 million at September 30, 2021 and December 31, 2020, respectively. During the second quarter of 2021, the Company added $50.6 million of goodwill from the ClickSWITCH acquisition. Goodwill represents the excess purchase price over the fair value of assets acquired. The Company has one operating segment and one reporting unit. Goodwill is tested for impairment on an annual basis in the fourth quarter of the fiscal year, and between annual tests if indicators of potential impairment exist, using a fair-value-based approach based on the market capitalization of the reporting unit. The annual impairment test was performed as of October 31, 2020, and no impairment of goodwill was identified, nor has any impairment of goodwill been recorded to date.


	As of September 30, 2021						As of December 31, 2020
	Gross Amount		Accumulated Amortization		Net Carrying Amount		Gross Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships	$	63,050	$	(25,441)	$	37,609	$	64,405	$	(18,568)	$	45,837
Non-compete agreements	13,275		(5,212)		8,063		12,705		(3,205)		9,500
Trademarks	19,870		(5,297)		14,573		19,870		(3,612)		16,258
Acquired technology	152,080		(46,617)		105,463		141,340		(30,256)		111,084

Capitalized software development costs	9,010		(3,758)		5,252		5,103		(2,923)		2,180
	$	257,285	$	(86,325)	$	170,960	$	243,423	$	(58,564)	$	184,859

The Company recorded intangible assets from the business combination discussed in Note 3 - Business Combinations. Intangible assets are amortized on a straight-line basis over their estimated useful lives, which range from two to ten years. Amortization expense included in cost of revenues in the condensed consolidated statements of comprehensive loss was $5.6 million and $5.3 million for the three months ended September 30, 2021 and 2020, respectively, and $16.4 million and $16.2 million for the nine months ended September 30, 2021 and 2020, respectively. Amortization expense included in operating expenses in the condensed consolidated statements of comprehensive loss was $4.5 million for each of the three months ended September 30, 2021 and 2020, and $13.5 million and $13.4 million for the nine months ended September 30, 2021 and 2020, respectively.

Gross capitalized software development costs were $9.0 million and $5.1 million as of September 30, 2021 and December 31, 2020, respectively. The Company amortized $0.4 million and $0.2 million of capitalized software development costs for the three months ended September 30, 2021 and 2020, respectively, and $0.8 million and $0.6 million for the nine months ended September 30, 2021 and 2020, respectively. Capitalized software development costs associated with internal use software and the Company's SaaS platform are computed on an individual product basis and those products available for market are amortized to cost of revenues over the products' estimated economic lives, which are expected to be three to five years.


	Amortization
Year Ended December 31,
2021 (October 1 to December 31)	$	10,458
2022	41,335
2023	40,578
2024	35,469
2025	23,229
Thereafter	19,891
Total amortization	$	170,960