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Cash, Cash Equivalents and Short-Term Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Cash, Cash Equivalents and Short-Term Investments [Abstract]  
Schedule of cash, cash equivalents and short-term investments

  

As of

December 31,
2017

  

As of

December 31, 
2016

 
Cash and cash equivalents $3,798,811  $5,150,344 
Short-term investments  -   5,474,013 
Total $3,798,811  $10,624,357 
Schedule of held to maturity securities

 

  

As of

December 31, 
2017

  

As of

December 31, 
2016

 
Amortized cost $        -  $5,450,000 
Accrued interest  -   24,013 
Gross unrealized gains  -   2,073 
Gross unrealized losses  -   (59)
Estimated fair value $-  $5,476,027