Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2021

Quarterly Financial Information Disclosure [Abstract]

Summary of Selected Quarterly Financial Data

The following tables provide the selected quarterly financial data for the years ended December 31, 2021 and 2020 (in thousands, except share and per share data):

	2021
	First			Second			Third			Fourth
	Quarter			Quarter			Quarter			Quarter
Statements of Operations Data:
Operating expenses:
Research and development	$	3,798		$	5,224		$	7,886		$	11,088
General and administrative		2,059			3,211			4,752			3,649
Total operating expenses		5,857			8,435			12,638			14,737
Loss from operations		(5,857	)		(8,435	)		(12,638	)		(14,737	)
Interest and other income (loss), net		5			36			32			27
Net loss	$	(5,852	)	$	(8,399	)	$	(12,606	)	$	(14,710	)
Net loss per share, basic and diluted	$	(0.49	)	$	(0.33	)	$	(0.43	)	$	(0.51	)
Weighted-average number of shares outstanding,    basic and diluted		11,964,205			25,161,038			29,001,213			29,061,076

	2020
	First			Second			Third			Fourth
	Quarter			Quarter			Quarter			Quarter
Statements of Operations Data:
Operating expenses:
Research and development	$	334		$	216		$	789		$	2,332
General and administrative		64			79			346			1,167
Total operating expenses		398			295			1,135			3,499
Loss from operations		(398	)		(295	)		(1,135	)		(3,499	)
Interest and other income (loss), net		—			2			—			1
Net loss	$	(398	)	$	(293	)	$	(1,135	)	$	(3,498	)
Net loss per share, basic and diluted	$	(0.05	)	$	(0.03	)	$	(0.10	)	$	(0.29	)
Weighted-average number of shares outstanding,    basic and diluted		8,758,995			9,746,868			11,724,100			11,871,494