(7) Goodwill and Intangible Assets, Net

Goodwill was $53.1 million and $31.3 million as of September 30, 2018 and December 31, 2017, respectively. There were no impairments recorded against goodwill during the nine months ended September 30, 2018 and for the year ended December 31, 2017. The following table displays the changes in the gross carrying amount of goodwill (in thousands):

	Amount
Balance at December 31, 2017	$	31,328
Foreign currency translation		(1,090	)
Increase due to acquisitions		22,894
Balance at September 30, 2018	$	53,132

Intangible assets consisted of the following (in thousands):

				As of September 30, 2018
	Gross carrying amount		Weighted average life (years)	Accumulated amortization			Net carrying amount
Amortizable intangible assets:
Developed technology	$	5,736	3.03	$	(3,006	)	$	2,730
Tradenames		3,253	4.43		(1,318	)		1,935
Non-compete		240	2.00		(200	)		40
Customer relationships		23,836	5.00		(6,541	)		17,295
Total intangible assets	$	33,065		$	(11,065	)	$	22,000

				As of December 31, 2017
	Gross carrying amount		Weighted average life (years)	Accumulated amortization			Net carrying amount
Amortizable intangible assets:
Developed technology	$	4,065	3.04	$	(2,017	)	$	2,048
Tradenames		2,495	5.18		(701	)		1,794
Non-compete		240	2.00		(110	)		130
Customer relationships		8,556	5.00		(3,894	)		4,662
Total intangible assets	$	15,356		$	(6,722	)	$	8,634

Amortization expense for intangible assets was $1.9 million and $0.9 million for the three months ended September 30, 2018 and 2017, respectively. Amortization expense for intangible assets was $4.5 million and $2.4 million for the nine months ended September 30, 2018 and 2017, respectively.

The expected amortization of the intangible assets, as of September 30, 2018, for each of the next five years and thereafter is as follows (in thousands):

	Amounts
2018 (for the remaining three months)	$	1,880
2019		6,428
2020		5,044
2021		4,556
2022		3,251
Thereafter		841
	$	22,000