Warrants (Tables)

3 Months Ended

Mar. 31, 2020

Warrant Activity

Summary of warrant activity

	Three Months Ended	Year Ended
	March 31, 2020	December 31, 2019
	(unaudited)
Warrants outstanding, beginning balance	19,421,892	34,682
Issuances	—	20,637,761
Exercises	(1,798,962)	(1,250,000)
Expirations and cancelations	—	(551)
Warrants outstanding, ending balance	17,622,930	19,421,892