Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets and Liabilities Other Than Goodwill -Amounts related to intangible assets (Details)

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Intangible Assets and Liabilities Other Than Goodwill -Amounts related to intangible assets (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Intangible assets $ 3,611,770 $ 3,498,307
Less - accumulated amortization (663,411) (601,849)
Intangible assets, net 2,948,359 2,896,458
Unfavorable contract liability 8,341,922 8,341,922
Less - accumulated amortization (876,972) (612,255)
Unfavorable contract liability, net 7,464,950 7,729,667
Product Certifications    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 651,639 605,704
Less - accumulated amortization (298,874) (285,341)
Intangible assets, net 352,765 320,363
Patents    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 844,309 808,323
Less - accumulated amortization (162,343) (154,972)
Intangible assets, net 681,966 653,351
Developed Technology    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 240,000 240,000
Less - accumulated amortization (80,000) (76,000)
Intangible assets, net 160,000 164,000
Favorable contract asset    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 1,561,739 1,561,739
Less - accumulated amortization (122,194) (85,536)
Intangible assets, net 1,439,545 1,476,203
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 20,540 19,540
Less - accumulated amortization 0 0
Intangible assets, net 20,540 19,540
In Process R&D    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 263,936 263,001
Less - accumulated amortization 0 0
Intangible assets, net $ 263,936 $ 263,001