Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Summary of Revenues, Operating Loss, Long-Lived Assets By Geographic Area (Details)

v3.8.0.1
Segment Information - Summary of Revenues, Operating Loss, Long-Lived Assets By Geographic Area (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Segment Reporting Information [Line Items]        
Revenue: $ 9,995,516 $ 9,859,997 $ 41,702,001  
Operating Income (Loss): [1] (2,380,841) (989,388) $ (2,619,888)  
Non-current Assets: 25,381,130     $ 28,383,458
United States [Member]        
Segment Reporting Information [Line Items]        
Revenue: 7,782,401 7,912,094    
Operating Income (Loss): [1] (963,012) (941,072)    
Non-current Assets: 24,163,653     24,630,101
South Africa [Member]        
Segment Reporting Information [Line Items]        
Revenue: 1,501,419 1,384,394    
Operating Income (Loss): [1] 10,546 (57,061)    
Non-current Assets: 1,217,477     1,203,610
Europe [Member]        
Segment Reporting Information [Line Items]        
Revenue: 711,696 563,509    
Operating Income (Loss): [1] (1,428,375) $ 8,745    
Non-current Assets:     $ 2,549,747
[1] Note that Operating Income (Loss) includes $1.7 million of non-cash impairment charges for the three months ended March 31, 2018