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Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2018
Summary of Significant Accounting Policies [Abstract]  
Cash, Cash Equivalents and Restricted Cash
Cash, cash equivalents and restricted cash consist of the following:

    
March 31,
2018
    
December 31,
2017
  
       
Cash and cash equivalents
 
$
171,136
  
$
18,142
 
Restricted cash
  
208
   
207
 
  
$
171,344
  
$
18,349
 
Short-term Investment
Short term investments at March 31, 2018 consist of the following:

  
Cost
Basis
    
Unrealized
Gains
    
Fair
Value
  
Current:
         
Certificates of deposit
 
$
1,546
  
$
-
  
$
1,546
 
United States Treasury securities
  
10,005
   
10
   
10,015
 
  
$
11,551
  
$
10
  
$
11,561