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Warrants

6 Months Ended

Jun. 30, 2020

6. Warrants

A rollforward of the common stock warrants outstanding at June 30, 2020 is as follows.

	Number of Warrants			Weighted Average Exercise Price			Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding December 31, 2019		18,953,195		$	3.55			4.17	$	—
Warrants issued		5,098,744		$	1.58
Warrants exercised		(847,184	)	$	(1.09	)
Pre-funded warrants exercised		(300,000	)	$	(0.01	)
Warrants expired		(2,515	)	$	(83.50	)
Outstanding June 30, 2020		22,902,240		$	3.23			3.20	$	5,711

The following represents a summary of the warrants outstanding at each of the dates identified:

					Number of Shares Underlying Warrants
					For the Period Ended June 30,
Issue Date	Classification	Exercise Price		Expiration Date	2020		2019
April 20, 2020	Equity	$	1.55	April 20, 2022		4,787,553		—
April 20, 2020	Equity	$	2.0888	April 20, 2022		311,191		—
April 8, 2019	Equity	$	0.01	—		—		670,000
April 8, 2019	Equity	$	1.35	April 8, 2024		11,692,518		12,266,665
April 8, 2019	Equity	$	1.6875	April 3, 2024		797,334		797,334
February 12, 2019	Equity	$	1.8313	February 7, 2024		110,922		110,922
February 12, 2019	Equity	$	1.34	August 12, 2024		1,433,447		1,706,484
February 04, 2019	Equity	$	2.125	January 30, 2024		34,605		34,605
January 31, 2019	Equity	$	2.125	January 26, 2024		10,151		10,151
December 3, 2018	Equity	$	3.90	June 3, 2024		937,500		937,500
April 3, 2018	Equity	$	7.50	April 3, 2023		2,350,011		2,350,011
April 4, 2018	Equity	$	7.50	April 4, 2023		115,000		115,000
August 31, 2015	Equity	$	118.00	August 31, 2020		3,000		3,000
June 15, 2015	Equity	$	75.50	Five years after milestone achievement		319,008		319,008
June 15, 2015	Equity	$	83.50	June 16, 2020		—		2,515
Total Outstanding						22,902,240		19,323,195