Selected Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Schedule of Selected Quarterly Financial Information

The following table contains selected quarterly financial information for 2020 and 2019. The Company believes that the following information reflects all normal recurring adjustments necessary for a fair statement of the information for the periods presented. The operating results for any quarter are not necessarily indicative of results for any future period.

	Three Months Ended
	March 31, 2020			June 30, 2020			September 30, 2020			December 31, 2020
Revenue	$	—		$	—		$	—		$	—
Operating expenses:
Research and development		4,069			2,488			2,684			1,925
General and administrative		2,807			1,912			2,344			2,267
Total operating expenses		6,876			4,400			5,028			4,192
Loss from operations		(6,876	)		(4,400	)		(5,028	)		(4,192	)
Other income (expense), net		62			10			5			(738	)
Net loss		(6,814	)		(4,390	)		(5,023	)		(4,930	)
Net loss per share—basic and diluted	$	(0.24	)	$	(0.14	)	$	(0.13	)	$	(0.12	)
Weighted average common shares outstanding—    basic and diluted		27,810,358			31,221,139			39,321,177			40,997,759
Comprehensive loss:
Net loss	$	(6,814	)	$	(4,390	)	$	(5,023	)	$	(4,930	)
Other comprehensive gain (loss):
Unrealized gain (loss) on investments, net of tax of $0		(8	)		(1	)		1			(1	)
Total other comprehensive gain (loss)		(8	)		(1	)		1			(1	)
Total comprehensive loss	$	(6,822	)	$	(4,391	)	$	(5,022	)	$	(4,931	)

	Three Months Ended
	March 31, 2019			June 30, 2019			September 30, 2019			December 31, 2019
Revenue	$	—		$	—		$	—		$	—
Operating expenses:
Research and development		4,174			4,305			4,475			4,709
General and administrative		3,139			3,075			3,440			2,639
Total operating expenses		7,313			7,380			7,915			7,348
Loss from operations		(7,313	)		(7,380	)		(7,915	)		(7,348	)
Other income (expense), net		101			208			166			112
Net loss		(7,212	)		(7,172	)		(7,749	)		(7,236	)
Net loss per share attributable to common stockholders—basic and diluted	$	(0.49	)	$	(0.26	)	$	(0.28	)	$	(0.26	)
Weighted average common shares outstanding—basic    and diluted		14,816,253			27,526,065			27,810,358			27,810,358
Comprehensive loss:
Net loss	$	(7,212	)	$	(7,172	)	$	(7,749	)	$	(7,236	)
Other comprehensive loss:
Unrealized loss on investments, net of tax of $0		5			24			(7	)		(10	)
Total other comprehensive loss		5			24			(7	)		(10	)
Total comprehensive loss	$	(7,207	)	$	(7,148	)	$	(7,756	)	$	(7,246	)