9.	INTANGIBLE ASSETS

The intangible assets described in Note 8 are being amortized to cost of goods sold over their useful lives, which are estimated to be 10 years. Intangible amortization expense was $4,776 and $6,134 during the three-month periods ended June 30, 2017 and 2016 and $9,552 and $15,442 during the six-month periods ended June 30, 2017 and 2016, respectively. The net value of these intangibles was $162,384 as of June 30, 2017. A summary of intangible amortization expense estimated for the periods subsequent to June 30, 2017 is as follows:

Period	Amount
Six months ending December 31, 2017	$	9,552
Year ending December 31, 2018	$	19,104
Year ending December 31, 2019	$	19,104
Year ending December 31, 2020	$	19,104
Year ending December 31, 2021	$	19,104
After December 31, 2021	$	76,416
Total	$	162,384

Intangible assets as of June 30, 2017 consisted of the following:

	Gross Carrying Value		Accumulated Amortization			Net Book Value
Developed technology	$	184,100	$	(27,615	)	$	156,485
Customer relationships		1,300		(195	)		1,105
Non-compete agreements		5,640		(846	)		4,794
Total	$	191,040	$	(28,656	)	$	162,384

Intangible assets as of December 31, 2016 consisted of the following:

	Gross Carrying Value		Accumulated Amortization			Net Book Value
Developed technology	$	184,100	$	(18,410	)	$	165,690
Customer relationships		1,300		(130	)		1,170
Non-compete agreements		5,640		(564	)		5,076
Total	$	191,040	$	(19,104	)	$	171,936