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Equity (Tables)
3 Months Ended
Mar. 31, 2016
Warrants [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of option and warrant activities
  Number of Units  Weighted 
Average 
Exercise 
Price
  Weighted 
Average 
Remaining 
Contractual 
Term 
(in years)
  Aggregate 
Intrinsic 
Value
 
             
Outstanding, December 31, 2015  8,954,031   3.73   2.93   10,199,230 
Exercised  (183,718)  -   -   - 
Outstanding, March 31, 2016  8,770,313   3.78   2.68   4,782,278 
                 
Exercisable, March 31, 2016  8,485,313   3.65   2.50   4,782,278 
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of option and warrant activities
  Number of Units  Weighted 
Average 
Exercise 
Price
  Weighted 
Average 
Remaining 
Contractual 
Term 
(in years)
  Aggregate 
Intrinsic 
Value
 
Outstanding, December 31, 2015  3,971,583   4.34   8.01   2,964,146 
Granted  244,500   2.14   9.88   - 
Cancelled  (100,000)  1.91   -   - 
Outstanding, March 31, 2016  4,116,083   4.27   7.85   937,786 
                 
Exercisable, March 31, 2016  2,006,628   3.61   6.37   893,426