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Stock Purchase Warrants - (Tables)
6 Months Ended
Jun. 30, 2019
Warrants and Rights Note Disclosure [Abstract]  
Schedule of warrants outstanding The following table describes the outstanding warrants classified in equity as of June 30, 2019:
 
 
December 2017 Warrants
Exercise price
 
$4.27
Expiration date
 
December 6, 2023
Total shares issuable on exercise
 
26,951