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Common Stock Warrants (Tables)
3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Schedule of Warrants Outstanding
Common stock warrants outstanding as of March 31, 2020 and December 31, 2019 are as follows:
Holder
 
Issue Date
 
Outstanding
Shares
 
Exercise
Price
 
Exercisable
Shares
 
Expiration
Date
 
 
(in thousands, except per share data)
Partner
 
3/1/2015
 
695

 
$2.28
 
695

 
2/28/2025
 
 
 
 
695

 

 
695