Warrants (Tables)

12 Months Ended

Dec. 31, 2019

Warrant Activity

Summary of warrant activity

	Year ended December 31,
	2019	2018
Warrants outstanding, beginning balance	34,682	4,590
Issuances	20,637,761	30,951
Exercises	(1,250,000)	—
Expirations and cancellations	(551)	(859)
Warrants outstanding, ending balance	19,421,892	34,682