Intangible Assets

12 Months Ended

Dec. 31, 2016

Intangible Assets.

Intangible Assets

7.  Intangible Assets

The gross carrying amount and accumulated amortization of the Company’s acquired identifiable intangible assets as of December 31, 2016 are as follows (in thousands):

	Weighted Average
	Amortization	Gross Carrying		Accumulated
	Period	Amount		Amortization		Total
Acquired technology	9  years	$	4,645		(928)		3,717
Customer relationships	10  years		260		(71)		189
Trademark	5  years		60		(33)		27
		$	4,965	$	(1,032)	$	3,933

The gross carrying amount and accumulated amortization of the Company’s acquired identifiable intangible assets as of December 31, 2015 are as follows (in thousands):

	Weighted Average
	Amortization	Gross Carrying		Accumulated
	Period	Amount		Amortization		Total
Acquired technology	9  years	$	4,793	$	(403)	$	4,390
Customer relationships	10  years		260		(45)		215
Trademark	5  years		60		(21)		39
		$	5,113	$	(469)	$	4,644

The change in the gross carrying amount of the acquired technology from December 31, 2015 to December 31, 2016 is due to changes attributed to foreign currency translation.

Amortization expense for acquired identifiable intangible assets for the years ended December 31, 2016, 2015, and 2014 was $0.6 million, $1.0 million, and $2.4 million, respectively. Estimated amortization expense for subsequent years is as follows (in thousands):

2017	$	568
2018		568
2019		461
2020		425
2021		425
Thereafter		1,486
Total	$	3,933