Common Stock Warrants (Tables)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Schedule of Warrants

The following table provides a roll forward of outstanding warrants for the nine month period ended September 30, 2021:

	Number of warrants	Weighted Average Exercise Price	Weighted Average Contractual Term (Years)
Outstanding and exercisable warrants to purchase common shares as of December 31, 2020	13,354,403	$13.52	3.70
Issued	50,000
Exercised	(2,130,000)
Cancelled	(25,275)
Outstanding and exercisable warrants to purchase common shares as of September 30, 2021	11,249,128	$10.92	2.97

As of September 30, 2021, the Company’s outstanding warrants to purchase shares of common stock consisted of the following:

Issuance Date	Number of Shares of Common Stock Issuable	Exercise Price			Expiration Date
October 25, 2016	5,155	$	19.78		October 24, 2026
December 28, 2017	115,916	$	19.78		December 28, 2027
September 12, 2018	20,220	$	19.78		September 12, 2028
October 19, 2018	20,016	$	19.78		October 19, 2028
March 13, 2019	5,000	$	19.78		March 12, 2029
April 16, 2019	3,866,154	$	13.20		April 15, 2024
November 29, 2019	5,416,667	$	8.70		November 28, 2024
November 29, 2019	1,750,000	$	12.00	(a)	n/a
March 23, 2021	50,000	$	8.70	(b)	n/a
	11,249,128

(a) In November 2019, the Company received $11.999 per pre-funded warrant, or $21.0 million in aggregate proceeds. Each pre-funded

warrant may be exercised for an additional $0.001 per pre-funded warrant.

(b) In March 2021, the Company received $8.69 per pre-funded warrant, or $435 thousand in aggregate proceeds. Each pre-funded warrant may be exercised for an additional $0.01 per pre-funded warrant.