Intangible assets (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2014

Dec. 31, 2013

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of Finite-Lived Intangible Assets

As of March 31, 2014 the Company has the following amounts related to intangible assets:

	Gross Carrying Amount		Accumulated Amortization
Patent costs	$	469,031	$	45,648
Product certifications	415,706		93,312
Developed technology	240,000		16,000
Total	$	1,124,737	$	154,960

The Company also capitalized $240,000 certain developed technology in connection with an asset acquisition which is being amortized over its useful life of fifteen years. Intangible assets at December 31, 2013 and 2012 consist of the following:

	Product Certifications			Patents			Developed Technology			Total
Balance at December 31, 2013
Intangible assets	$	406,706		$	441,609		240,000			$	1,088,315
Less - accumulated amortization	(83,405		)	(39,583		)	(12,000		)	(134,988		)
	$	323,301		$	402,026		$	228,000		$	953,327
Balance at December 31, 2012
Intangible assets	$	235,482		$	214,883		—			$	450,365
Less - accumulated amortization	(57,798		)	(20,547		)	—			(78,345		)
	$	177,684		$	194,336		$	—		$	372,020

Schedule of Estimated Future Amortization Expense

Estimated future annual amortization expense related to the intangible assets is as follows:

2014	$	59,917
2015	124,575
2016	124,575
2017	124,575
2018	118,378
Thereafter	417,757
	$	969,777

Estimated amortization expense at December 31, 2013 for each of the five succeeding years is as follows:

2014	$	80,937
2015	119,758
2016	119,758
2017	119,758
2018	113,560
Thereafter	399,556
	$	953,327