Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2021

Schedule of Stock-Based Compensation Expense Recognized

Total stock-based compensation expense was recognized in our condensed consolidated statements of operations and comprehensive loss as follows (in thousands):

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2021		2020		2021		2020
Research and development	$	872	$	336	$	2,342	$	539
General and administrative		1,171		542		3,509		973
Total stock-based compensation	$	2,043	$	878	$	5,851	$	1,512

Common Stock Warrants [Member]

Class Of Stock [Line Items]

Schedule of Warrant Activity

The following table shows the warrant activity:

	Rollforward of Warrant Activity
	Registered direct warrants, placement agent		Private placement warrants		Private placement warrants, placement agent		Warrants exchanged for common stock		Warrants exchanged for preferred stock warrants		Total
Balance as of December 31, 2020		9,581		319,064		9,177		—		—		337,822
Issued		—		—		—		509,117		298,692		807,809
Exercised		—		—		—		—		—		—
Cancelled/Expired		—		—		—		—		—		—
Balance as of September 30, 2021		9,581		319,064		9,177		509,117		298,692		1,145,631

Preferred Stock Warrants [Member]

Class Of Stock [Line Items]

Schedule of Warrant Activity

The following table shows the warrant activity:

	Rollforward of Warrant Activity
		Warrants assumed and replaced in acquisition			Total
Balance as of December 31, 2020			55,583.875			55,583.875
Assumed and replaced			—			—
Exercised			—			—
Cancelled/Exchanged			(5,376.456	)		(5,376.456	)
Balance as of September 30, 2021			50,207.419			50,207.419