(7) Goodwill and Intangible Assets

Goodwill was $53.0 million and $31.3 million as of June 30, 2018 and December 31, 2017, respectively. There were no impairments recorded against goodwill during the six months ended June 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		(1,174	)
Increase due to acquisitions		22,894
Balance at June 30, 2018	$	53,048

Intangible assets consisted of the following (in thousands):

				As of June 30, 2018
	Gross carrying amount		Weighted average life (years)	Accumulated amortization			Net carrying amount
Amortizable intangible assets:
Developed technology	$	5,739	3.03	$	(2,620	)	$	3,119
Tradenames		3,231	4.43		(1,057	)		2,174
Non-compete		240	2.00		(170	)		70
Customer relationships		23,864	5.00		(5,385	)		18,479
Total intangible assets	$	33,074		$	(9,232	)	$	23,842

				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 $1.8 million and $0.9 million for the three months ended June 30, 2018 and 2017, respectively. Amortization expense for intangible assets was $2.7 million and $1.5 million for the six months ended June 30, 2018 and 2017, respectively.

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

	Amounts
2018 (for the remaining six months)	$	3,760
2019		6,413
2020		5,028
2021		4,541
2022 and thereafter		4,100
	$	23,842