Quarterly report pursuant to Section 13 or 15(d)

Contract Assets and Contract Liabilities - Summary of Contract Assets and Liabilities (Details)

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Contract Assets and Contract Liabilities - Summary of Contract Assets and Liabilities (Details) - USD ($)
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]    
Contract assets $ 15,003,984 $ 6,074,346
Change in contract assets 8,929,638  
Contract liabilities (500,668) (367,552)
Change in contract liabilities (133,116)  
Net contract assets 14,503,316 $ 5,706,794
Total $ 8,796,522