Intangible Assets

6 Months Ended

Jun. 30, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

4. Intangible Assets

Intangible assets as of June 30, 2016 and December 31, 2015 consisted of the following:

	Estimated useful lives	June 30, 2016			December 31, 2015
Tradename	5 to 7 years	$	555		$	555
Patents and technological know-how	10 years		5,927			5,850
Proprietary software	3 to 15 years		4,341			4,341
Other	3 to 5 years		324			324
Total intangible assets			11,147			11,070
Accumulated amortization			(5,007	)		(4,432	)
Total intangible assets, net		$	6,140		$	6,638

The amortization of intangible assets for the three and six months ended June 30, 2016 and June 30, 2015 was as follows:

	Three months ended June 30,				Six months ended June 30,
	2016		2015		2016		2015
Amortization of intangible assets	$	286	$	315	$	576	$	629

The estimated future amortization expense of intangible assets is as follows:

Years ending December 31,
2016 (remainder)	$	545
2017		925
2018		851
2019		778
2020		560
Thereafter		2,481
	$	6,140