Intangible assets other than goodwill - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Schedule of Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 1,482,971	$ 1,363,306
Less - accumulated amortization	(417,004)	(318,695)
Intangible Assets, Net	1,065,967	1,044,611
Product Certifications
Schedule of Finite-Lived Intangible Assets [Line Items]
Intangible assets	544,651	514,616
Less - accumulated amortization	(233,992)	(182,931)
Intangible Assets, Net	310,659	331,685
Patents
Schedule of Finite-Lived Intangible Assets [Line Items]
Intangible assets	681,155	603,915
Less - accumulated amortization	(123,012)	(91,764)
Intangible Assets, Net	558,143	512,151
Developed Technology
Schedule of Finite-Lived Intangible Assets [Line Items]
Intangible assets	240,000	240,000
Less - accumulated amortization	(60,000)	(44,000)
Intangible Assets, Net	180,000	196,000
Trademarks
Schedule of Finite-Lived Intangible Assets [Line Items]
Intangible assets	17,165	4,775
Intangible Assets, Net	$ 17,165	$ 4,775