Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2023

Stockholders' Equity

Schedule of warrants issued and outstanding

Year Issued	Equity Instrument	Warrants Outstanding	Exercise Price		Date of Expiration
2019	Common Stock	331,858	$	37.50	2/7/2024
2023 (1)	Common Stock	7,368,738	$	8.03	10/16/2028
Total		7,700,596
Weighted average exercise price			$	9.30
Weighted average life in years					4.60

(1) 1,571,093 pre-funded warrants were issued and outstanding in 2023, not included in the table above, with an exercise price of $0.001 and are exercisable until all pre-funded warrants are exercised in full.

Schedule of reserved for future issuance

	December 31,	December 31,
	2023	2022
Warrants for the purchase of common stock	9,271,689	1,530,176
Reserve under the 2015 Amended and Restated Stock Incentive Plan and the 2022 Inducement Stock Incentive Plan	5,334,301	1,013,520
Series X Preferred Stock	5,184,591	5,242,501
Options outstanding to purchase common stock	3,553,969	2,253,431
Shares reserved for the employee stock purchase plan	43,060	36,982
Total	23,387,610	10,076,610