Quarterly report pursuant to Section 13 or 15(d)

Intangible assets and liabilities other than goodwill and excess of cost over fair value of net assets acquired -Amounts related to intangible assets (Details)

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Intangible assets and liabilities other than goodwill and excess of cost over fair value of net assets acquired -Amounts related to intangible assets (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Intangible assets $ 2,973,688 $ 1,482,971
Less - accumulated amortization (543,510) (417,004)
Intangible assets, net 2,430,178 1,065,967
Unfavorable contract liability 10,838,571 0
Less - accumulated amortization (480,288) 0
Unfavorable contract liability, net 10,358,283 0
Product Certifications    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 602,202 544,651
Less - accumulated amortization (272,503) (233,992)
Intangible assets, net 329,699 310,659
Patents    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 656,105 681,155
Less - accumulated amortization (146,983) (123,012)
Intangible assets, net 509,122 558,143
Developed Technology    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 240,000 240,000
Less - accumulated amortization (72,000) (60,000)
Intangible assets, net 168,000 180,000
Favorable contract asset    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 1,456,166 0
Less - accumulated amortization (52,024) 0
Intangible assets, net 1,404,142 0
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 19,215 17,165
Less - accumulated amortization 0 0
Intangible assets, net $ 19,215 $ 17,165