Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2024

Equity [Abstract]

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

As of June 30, 2024, the Company had issued and outstanding warrants to purchase shares of the Company’s common stock as follows, which all met the condition for equity classification (in thousands):

Year Issued	Expiration Date	Number Outstanding as of December 31, 2023		Issued		Exercised			Cancelled/Expired		Number Outstanding as of June 30, 2024		Range of Exercise Price
2017	March 2025 - June 2025		126		—		—			—		126	$0.14 - $21.80
2019	March 2025 - April 2027		44		—		—			—		44	$0.14 - $21.80
2022	August 2025 - December 2029		123		—		—			—		123	$0.14 - $168.35
2023	December 2025 - April 2029		3,211		—		(780	)		—		2,431	$3.25 - $5.26
Total number of shares    underlying warrants			3,504		—		(780	)		—		2,724

As of June 30, 2023, the Company had issued and outstanding warrants to purchase shares of the Company’s common stock as follows, which all met the condition for equity classification (in thousands):

Year Issued	Expiration Date	Number Outstanding as of December 31, 2022		Issued		Exercised			Cancelled/Expired			Number Outstanding as of June 30, 2023		Range of Exercise Price
2013	April 2023		12		—		—			(12	)		—
2017	November 2023 - June 2025		131		—		—			—			131	$0.14 - $21.80
2019	March 2025 - April 2027		44		—		—			(4	)		40	$0.14 - $21.80
2020	October 2023		45		—		—			—			45	$	0.14
2022	August 2025 - December 2029		301		—		(128	)		—			173	$0.14 - $168.35
2023	August 2028 - April 2033		—		1,973		(67	)		—			1,906	$4.08 - $5.26
Total number of shares underlying warrants			533		1,973		(195	)		(16	)		2,295

Schedule of Common Stock Reserved for Future Issuance

Common stock reserved for future issuance consisted of the following as the period presented:

	June 30, 2024
	(in thousands)
Shares reserved for stock options and restricted stock units to purchase    common stock under equity incentive plans		2,456
Shares reserved for future issuance of equity awards		702
Shares reserved for exercise of warrants		2,724
Total		5,882