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Warrants (Tables)
 9 Months Ended
Sep. 30, 2019
Warrants [Abstract]  
Warrant Liability
A roll-forward of warrant liability is as follows:

  
Warrant
Liability
 
    
Balance at December 31, 2017
 
$
7,673
 
Changes in fair value recognized
  
5,278
 
Exercise of warrants
  
(12,951
)
Balance at September 30, 2018
 
$
-