Annual report pursuant to Section 13 and 15(d)

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

v3.19.1
Contract Assets and Contract Liabilities - Summary of Contract Assets and Liabilities (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]    
Contract assets $ 12,030,000 $ 6,074,346
Change in contract assets 5,955,654  
Contract liabilities (1,845,049) (367,552)
Change in contract liabilities (1,477,497)  
Net contract assets 10,184,951 $ 5,706,794
Total $ 4,478,157