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Warrants (Tables)
6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Schedule of Warrants Issued and Outstanding

As of June 30, 2019, the following warrants for common stock were issued and outstanding:
Issue date
 
Expiration date
 
Exercise price
 
Number of warrants outstanding
January 11, 2017
 
None
 
$
0.001

 
5,858,238

November 20, 2017
 
None
 
$
0.001

 
4,137,999

June 11, 2018
 
None
 
$
0.001

 
421,650

 
 
 
 
 
 
10,417,887