Intangible assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Schedule of Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 1,363,306	$ 1,230,274
Less - accumulated amortization	(318,695)	(218,974)
Intangible Assets, Net	1,044,611	1,011,300
Product Certifications
Schedule of Finite-Lived Intangible Assets [Line Items]
Intangible assets	514,616	475,344
Less - accumulated amortization	(182,931)	(128,732)
Intangible Assets, Net	331,685	346,612
Patents
Schedule of Finite-Lived Intangible Assets [Line Items]
Intangible assets	603,915	514,930
Less - accumulated amortization	(91,764)	(62,242)
Intangible Assets, Net	512,151	452,688
Developed Technology
Schedule of Finite-Lived Intangible Assets [Line Items]
Intangible assets	240,000	240,000
Less - accumulated amortization	(44,000)	(28,000)
Intangible Assets, Net	196,000	$ 212,000
Trademarks
Schedule of Finite-Lived Intangible Assets [Line Items]
Intangible assets	4,775
Intangible Assets, Net	$ 4,775