The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Goodwill and intangible assets - Intangible assets (Details) - USD ($)	3 Months Ended		9 Months Ended		21 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Intangible assets
Gross book value	$ 3,813,755		$ 3,813,755		$ 3,813,755	$ 3,508,116
Accumulated amortization	(3,208,098)		(3,208,098)		(3,208,098)	(2,680,642)
Net book value	605,657		605,657		605,657	827,474
Amortization expense	21,104	$ 143,692	246,295	$ 431,710
Trademarks and patents
Intangible assets
Gross book value	1,226,007		1,226,007		1,226,007	1,203,097
Accumulated amortization	(620,350)		(620,350)		(620,350)	(557,794)
Net book value	605,657		605,657		$ 605,657	645,303
Trademarks and patents \| Minimum
Intangible assets
Amortization period					15 years
Trademarks and patents \| Maximum
Intangible assets
Amortization period					21 years
Technology
Intangible assets
Gross book value	2,587,748		2,587,748		$ 2,587,748	2,305,019
Accumulated amortization	$ (2,587,748)		$ (2,587,748)		$ (2,587,748)	(2,122,848)
Net book value						$ 182,171
Amortization period					5 years