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 ($133) during the three-month periods ended September 30, 2017 and 2016 and $14,328 and $15,309 during the nine-month periods ended September 30, 2017 and 2016, respectively. The net value of these intangibles was $157,608 as of September 30, 2017. A summary of intangible amortization expense estimated for the periods subsequent to September 30, 2017 is as follows:

Period	Amount
Three months ending December 31, 2017	$	4,776
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	$	157,608

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

	Gross Carrying Value		Accumulated Amortization			Net Book Value
Developed technology	$	184,100	$	(32,218	)	$	151,882
Customer relationships		1,300		(227	)		1,073
Non-compete agreements		5,640		(987	)		4,653
Total	$	191,040	$	(33,432	)	$	157,608

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