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 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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Dec. 31, 2015
Intangible assets
Gross book value	$ 3,658,072		$ 3,658,072		$ 3,658,072	$ 3,573,464
Accumulated amortization	(2,676,793)		(2,676,793)		(2,676,793)	(2,195,200)
Net book value	981,279		981,279		981,279	1,378,264
Amortization expense	143,692	$ 143,599	431,710	$ 431,388
Trademarks and patents
Intangible assets
Gross book value	1,202,666		1,202,666		1,202,666	1,184,612
Accumulated amortization	(538,214)		(538,214)		(538,214)	(472,914)
Net book value	664,452		664,452		$ 664,452	711,698
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	2,455,406		2,455,406		$ 2,455,406	2,388,852
Accumulated amortization	(2,138,579)		(2,138,579)		(2,138,579)	(1,722,286)
Net book value	$ 316,827		$ 316,827		$ 316,827	$ 666,566
Amortization period					5 years