Intangible assets, net

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



(In thousands)	Amortization period	December 31, 2018			December 31, 2017
Gross amount:
Software developed for internal use	3 years	$	3,037		$	2,972
Acquired proprietary technology	5 years	11,459			11,382
Customer relationships	7-10 years	34,986			34,986
Trade names	20 years	16,357			16,357
Domain names	20 years	191			191
Databases	5-10 years	31,292			31,292
Non-competition agreements	2-5 years	1,768			1,768
		99,090			98,948
Accumulated amortization:
Software developed for internal use		(1,282		)	(490		)
Acquired proprietary technology		(6,987		)	(4,693		)
Customer relationships		(14,417		)	(9,628		)
Trade names		(2,504		)	(1,686		)
Domain names		(29		)	(20		)
Databases		(10,573		)	(6,964		)
Non-competition agreements		(1,486		)	(1,113		)
		(37,278		)	(24,594		)
Net intangible assets:
Software developed for internal use		1,755			2,482
Acquired proprietary technology		4,472			6,689
Customer relationships		20,569			25,358
Trade names		13,853			14,671
Domain names		162			171
Databases		20,719			24,328
Non-competition agreements		282			655
		$	61,812		$	74,354

The gross amounts associated with software developed for internal use primarily represent capitalized costs of internally- developed software. 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 Fluent Acquisition and the Q Interactive Acquisition.

For the year ended December 31, 2018, the Company recognized a $1,517 impairment loss related to software capitalized for internal use, but not yet placed into service. The Company determined that the value of these capitalized assets was not recoverable and, as such, was written off in the period that the determination was made and included in write-off of long-lived assets on the consolidated statements of operations.

On January 18, 2017, the Company's management and Board of Directors approved a plan to fully integrate Q Interactive's business into Fluent, LLC. As a result of the integration, the remaining balance of long-lived assets of $3,626, related primarily to the acquired proprietary technology and trade names acquired in the Q Interactive Acquisition, was written off during the first quarter of 2017 and included in write-off of long-lived assets on the consolidated statements of operations.

For the years ended December 31, 2018 and 2017, amortization expenses related to intangible assets and included in depreciation and amortization expenses in the Company's consolidated statements of operations were $12,684 and $12,574, respectively.

For the years ended December 31, 2018 and 2017, the Company capitalized $1,659 and $1,438, respectively, which included $1,582 and $1,438 related to internally-developed software, respectively, $1,517 of which was written off during the year ended December 31, 2018.

As of December 31, 2018, estimated amortization expenses related to the Company’s intangible assets for 2019 through 2024 and thereafter are as follows:



(In thousands)
Year	December 31, 2018
2019	$	12,495
2020	12,371
2021	8,757
2022	8,008
2023	3,967
2024 and thereafter	16,214
Total	$	61,812