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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of Derivative Liability Categorized with Level 3
A roll-forward of the derivative liability categorized with Level 3 inputs is as follows:
 
 
 
Derivative Instruments
 
Balance — January 1, 2017
 
$
35
 
Change in fair value
 
 
(34
)
Balance — December 31, 2017
 
 
1
 
Change in fair value
 
 
(1
)
Balance — December 31, 2018
 
$