Warrants to Purchase Common Stock (Tables)

9 Months Ended

Sep. 30, 2021

Warrants To Purchase Common Stock

Share-based Payment Arrangement, Outstanding Award, Activity, Excluding Option [Table Text Block]

Summary of activity related to warrants
	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
Outstanding at January 1, 2021		2,516,778		$	3.30		0.83
Issued		—			—		—
Exercised		(2,516,778	)		3.30		—
Outstanding at September 30, 2021		—		$	—		—

A summary of activity related to warrants for the nine months ended September 30, 2020 follows:

	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term
Outstanding at January 1, 2020		4,531,924		$	0.72		4.05
Issued		4,972,254			2.34		0.92
Exercised		(6,481,924	)		0.74		—
Outstanding at September 30, 2020		3,022,254		$	2.97		0.69
Exercisable at September 30, 2020		505,476		$	2.97		0.69