Warrants (Tables)

6 Months Ended

Jun. 30, 2020

Warrants

Summary of warrant activity

	June 30, 2020	December 31, 2019
	(unaudited)
Warrants outstanding, beginning balance	19,421,892	34,682
Issuances	8,771,632	20,637,761
Exercises	(11,202,129)	(1,250,000)
Expirations and cancelations	—	(551)
Warrants outstanding, ending balance	16,991,395	19,421,892