ACQUIRED INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

ACQUIRED INTANGIBLE ASSETS

ACQUIRED INTANGIBLE ASSETS

The Company entered into various transactions accounted for as business combinations during the years ended December 31, 2019 and December 31, 2018, that involved the acquisition of intangible assets. Refer to Note 7 for further details.

The following table presents the detail of acquired intangible assets as of the periods presented (in thousands):

	Balance at December 31, 2019
	Cost		Accumulated Amortization		Net
Technology assets	$	53,900	$	(31,873)	$	22,027
Customer assets	44,000		(6,934)		37,066
Trade name	11,300		(4,473)		6,827
Other	5,299		(2,140)		3,159
Total	$	114,499	$	(45,420)	$	69,079

	Balance at December 31, 2018
	Cost		Accumulated Amortization		Net
Technology assets	$	45,978	$	(28,420)	$	17,558
Customer assets	57,109		(8,068)		49,041
Trade name	11,300		(1,648)		9,652
Other	2,246		(1,395)		851
Total	$	116,633	$	(39,531)	$	77,102

All intangible assets are amortized over their estimated useful lives. The weighted average amortization periods for acquired technology, customer intangible assets, and acquired trade name are approximately 5 years, 12 years, and 4 years, respectively.

The changes to the carrying value of intangible assets were as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
Acquired intangible assets, net, beginning of the period	$	77,102	$	14,334	$	19,292
Acquisitions	14,559		75,871		2,657
Amortization expense	(15,000)		(13,103)		(7,615)
Sale of asset group (Note 8)	(7,582)		—		—
Acquired intangible assets, net, end of the period	$	69,079	$	77,102	$	14,334

The total estimated future amortization expense of these intangible assets as of December 31, 2019 is as follows (in thousands):

2020	$	12,800
2021	11,829
2022	10,134
2023	8,917
2024	5,940
Thereafter	19,459
Total	$	69,079