Quarterly report pursuant to Section 13 or 15(d)

Business Segment Information - Narrative (Details)

v3.19.1
Business Segment Information - Narrative (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
Segment
Mar. 31, 2018
USD ($)
Segment Reporting Information [Line Items]    
Number of operating segments | Segment 2  
Total revenue $ 47,480,256 $ 34,438,696
Non-US    
Segment Reporting Information [Line Items]    
Material amounts of sales or transfers between segments 0  
Total revenue $ 0