Annual report pursuant to Section 13 and 15(d)

Intangible assets other than goodwill - Schedule of Estimated Future Amortization Expense (Details)

v3.19.1
Intangible assets other than goodwill - Schedule of Estimated Future Amortization Expense (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, net $ 2,893,990 $ 2,896,458
Contract Asset and Liability    
Finite-Lived Intangible Assets [Line Items]    
2019 458,593  
2020 437,329  
2021 468,273  
2022 449,717  
2023 380,130  
Thereafter 1,227,320  
Intangible assets, net 3,421,362  
Contract Asset and Liability | Contract related intangibles    
Finite-Lived Intangible Assets [Line Items]    
2019 705,430  
2020 675,232  
2021 680,719  
2022 655,086  
2023 578,426  
Thereafter 1,668,066  
Intangible assets, net 4,962,959  
Contract Asset and Liability | Non-contract related intangibles    
Finite-Lived Intangible Assets [Line Items]    
2019 246,837  
2020 237,903  
2021 212,446  
2022 205,369  
2023 198,296  
Thereafter 440,746  
Intangible assets, net $ 1,541,597