Warrants (Tables)

12 Months Ended

Dec. 31, 2022

Warrants and Rights Note Disclosure [Abstract]

Schedule of Outstanding Warrants to Purchase the Company's Common Stock

The fair value was estimated to be $0.8853 per warrant as of December 31, 2022 and the significant inputs used in the estimation of the fair value were as follows:

Risk-free interest rate	3.96%
Expected term in years	7.5
Expected volatility	80.0%

As of December 31, 2022 and 2021, the outstanding warrants to purchase the Company’s common stock consist of the following:

			Warrants Outstanding
	Exercise Price	Expiration Date	as of December 31,
			2022	2021
Warrants issued in 2015	$5.25	01/30/2025	3,808	3,808
Warrants issued with 2018 Convertible Notes	$0.10	06/07/2028	346,689	346,689
Warrants issued with 2018 Term Loan	$16.67	07/31/2028	26,998	26,998
2019 Warrants	$16.67	05/20/2029	419,992	419,992
2022 Warrants	$1.11	6/30/2030	3,779,018	—
Total warrants outstanding			4,576,505	797,487

The Company’s warrant activity for the years ended December 31, 2022 and 2021 is as follows:

	Warrants	Weighted Average Exercise Price	Weighted Average Remaining Contractual Life (in years)
Balance - December 31, 2020	824,608	$9.10	7.9
Exercised, net	(26,958)	$0.10	6.2
Shares withheld for exercise price	(163)	$0.10	6.2
Balance - December 31, 2021	797,487	$9.41	5.9
Granted	3,779,018	$1.11	7.5
Balance - December 31, 2022	4,576,505	$2.56	7.2