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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2019
Fair Value of Financial Instruments [Abstract]  
Fair Value of Level 3 Warants
The following is a rollforward of the fair value of Level 3 items:
 
(in thousands)
   
Balance December 31, 2018
 
$
126
 
Change in fair value
  
(126
)
Balance as of June 30, 2019
 
$
-