Intangible assets, net

Intangible assets, net, other than goodwill, consist of the following:

	Amortization period (in years)		March 31, 2020			December 31, 2019
Gross amount:
Software developed for internal use		3	$	5,473		$	4,866
Acquired proprietary technology		4-5		13,719			13,661
Customer relationships		6-10		37,286			37,286
Trade names		4-20		16,657			16,657
Domain names		20		191			191
Databases		5-10		31,292			31,292
Non-competition agreements		2-5		1,768			1,768
Total gross amount				106,386			105,721
Accumulated amortization:
Software developed for internal use				(2,369	)		(1,995	)
Acquired proprietary technology				(10,232	)		(9,516	)
Customer relationships				(20,689	)		(19,396	)
Trade names				(3,583	)		(3,359	)
Domain names				(41	)		(39	)
Databases				(15,084	)		(14,182	)
Non-competition agreements				(1,668	)		(1,631	)
Total accumulated amortization				(53,666	)		(50,118	)
Net intangible assets:
Software developed for internal use				3,104			2,871
Acquired proprietary technology				3,487			4,145
Customer relationships				16,597			17,890
Trade names				13,074			13,298
Domain names				150			152
Databases				16,208			17,110
Non-competition agreements				100			137
Total intangible assets, net			$	52,720		$	55,603

The amounts relating to acquired proprietary technology, customer relationships, trade names, domain names, databases and non-competition agreements primarily represent the fair values of intangible assets acquired as a result of the acquisition of Fluent, LLC, effective

December 8, 2015 (

the "Fluent LLC Acquisition"),

the acquisition of Q Interactive, LLC, effective

June 8, 2016 (

the "Q Interactive Acquisition") and the acquisition of substantially all the assets of AdParlor

Holdings, Inc. and certain of its affiliates

, effective

July 1, 2019 (

see

Note

Business acquisition

During the

three

months ended

March 31, 2020

, the Company determined that the decline in market value of its publicly traded stock and the macroeconomic conditions arising from the global COVID-

pandemic constituted an impairment triggering event. As such, the Company conducted an interim test of the recoverability of its long-lived assets. Based on the results of this recoverability test, which measured the Company's projected undiscounted cash flows as compared to the carrying value of the asset group, the Company determined that, as of

March 31, 2020

, its long-lived assets were

not

impaired. The Company believes that the assumptions utilized in this interim impairment testing, including the determination of estimated future cash flows, are reasonable. Future tests

may

indicate impairment if actual future cash flows or other factors differ from the assumptions used in the Company's interim impairment test at

March 31, 2020

Amortization expense of

$3,547

and

$3,125

for the

three

months ended

March 31, 2020

and

2019

, respectively, is included in depreciation and amortization expenses in the consolidated statements of operations. As of

March 31, 2020

, intangible assets with a carrying amount of

$119

, included in the gross amount of software developed for internal use, have

not

commenced amortization, as they are

not

ready for their intended use.

As of

March 31, 2020

, estimated amortization expense related to the Company's intangible assets for the remainder of

2020

and through

2025

and thereafter are as follows:

Year	March 31, 2020
Remainder of 2020	$	10,519
2021		11,262
2022		9,444
2023		4,714
2024		4,350
2025 and thereafter		12,431
Total	$	52,720