Quarterly report pursuant to Section 13 or 15(d)

REVENUES - Narrative (Details)

v3.19.3
REVENUES - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
contract
Sep. 30, 2018
contract
Sep. 30, 2019
USD ($)
contract
Sep. 30, 2018
USD ($)
contract
Dec. 31, 2018
USD ($)
Disaggregation of Revenue [Line Items]          
Concentration risk, percentage 100.00% 100.00% 100.00% 100.00%  
Number of active contracts | contract 490 525 490 525  
Increase in net contract assets and liabilities     $ 6,700,000    
Contract with customer, liability, revenue recognized     5,100,000 $ 5,200,000  
Trade receivables, net $ 17,163,788   $ 17,163,788   $ 16,259,809
Transferred over Time          
Disaggregation of Revenue [Line Items]          
Concentration risk, percentage 91.00% 92.00% 91.00% 92.00%