| Summary of Revenues, Operating Loss, Long-Lived Assets By Geographic Area | 
 The Company operates
and reports its results as a single operating segment. Revenues and operating loss by geographic area were as follows: 
  
    |   | 
      | 
    Three Months Ended | 
      | 
      | 
    Nine Months Ended | 
      | 
 
    |   | 
      | 
     September 30, 2015  | 
      | 
      | 
    September 30, 2014 | 
      | 
      | 
     September 30, 2015  | 
      | 
      | 
    September 30, 2014 | 
      | 
 
    | Revenue: | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | United States | 
      | 
    $ | 
    6,872,531 | 
      | 
      | 
    $ | 
    3,642,971 | 
      | 
      | 
    $ | 
    17,200,288 | 
      | 
      | 
    $ | 
    9,477,879 | 
      | 
 
    | South Africa | 
      | 
      | 
    1,380,665 | 
      | 
      | 
      | 
    1,601,493 | 
      | 
      | 
      | 
    4,626,094 | 
      | 
      | 
      | 
    4,905,249 | 
      | 
 
    | Australia | 
      | 
      | 
    830,653 | 
      | 
      | 
      | 
    2,641,909 | 
      | 
      | 
      | 
    4,824,036 | 
      | 
      | 
      | 
    3,153,589 | 
      | 
 
    | Europe | 
      | 
      | 
    1,187,456 | 
      | 
      | 
      | 
    1,426,179 | 
      | 
      | 
      | 
    3,085,071 | 
      | 
      | 
      | 
    3,669,177 | 
      | 
 
    |   | 
      | 
    $ | 
    10,271,305 | 
      | 
      | 
    $ | 
    9,312,552 | 
      | 
      | 
    $ | 
    29,735,489 | 
      | 
      | 
    $ | 
    21,205,894 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Operating Income (Loss): | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | United States | 
      | 
    $ | 
    (1,150,856 | 
    ) | 
      | 
    $ | 
    (673,118 | 
    ) | 
      | 
    $ | 
    (4,267,634 | 
    ) | 
      | 
    $ | 
    (3,247,467 | 
    ) | 
 
    | South Africa | 
      | 
      | 
    (25,739 | 
    ) | 
      | 
      | 
    (70,571 | 
    ) | 
      | 
      | 
    (43,178 | 
    ) | 
      | 
      | 
    (220,186 | 
    ) | 
 
    | Australia | 
      | 
      | 
    (4,608,773 | 
    ) | 
      | 
      | 
    192,556 | 
      | 
      | 
      | 
    (5,466,548 | 
    ) | 
      | 
      | 
    (88,002 | 
    ) | 
 
    | Europe | 
      | 
      | 
    34,179 | 
      | 
      | 
      | 
    19,007 | 
      | 
      | 
      | 
    33,650 | 
      | 
      | 
      | 
    44,816 | 
      | 
 
    |   | 
      | 
    $ | 
    (5,751,189 | 
    ) | 
      | 
    $ | 
    (532,126 | 
    ) | 
      | 
    $ | 
    (9,743,710 | 
    ) | 
      | 
    $ | 
    (3,510,839 | 
    ) | 
 
 
  
Non-current assets
by geographic area were as follows: 
  
    |   | 
      | 
     September 30, 2015  | 
      | 
      | 
    December 31, 2014 | 
      | 
 
    | Non-current Assets: | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | United States | 
      | 
    $ | 
    33,226,470 | 
      | 
      | 
    $ | 
    15,299,108 | 
      | 
 
    | South Africa | 
      | 
      | 
    2,428,590 | 
      | 
      | 
      | 
    2,172,528 | 
      | 
 
    | Australia | 
      | 
      | 
    404,717 | 
      | 
      | 
      | 
    13,068,305 | 
      | 
 
    | Europe | 
      | 
      | 
    3,354,803 | 
      | 
      | 
      | 
    3,648,133 | 
      | 
 
    | Brazil | 
      | 
      | 
    135,000 | 
      | 
      | 
      | 
    135,000 | 
      | 
 
    |   | 
      | 
    $ | 
    39,549,580 | 
      | 
      | 
    $ | 
    34,323,074 | 
      | 
 
 
 |