Selected Quarterly Information (Unaudited)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Information (Unaudited)

17. Selected Quarterly Information (Unaudited)

        (in thousands, except per share amounts)

Year Ended December 31, 2020	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Revenue	$	—		$	—		$	—		$	—
Total operating expenses		18,660			18,606			20,321			22,774
Loss from operations		(18,660	)		(18,606	)		(20,321	)		(22,774	)
Net income (loss) applicable to common shareholders		(18,293	)		(18,596	)		(20,315	)		(22,772	)
Net income (loss) per share, basic	$	(0.09	)	$	(0.09	)	$	(0.10	)	$	(0.11	)
Net income (loss) per share, diluted	$	(0.09	)	$	(0.09	)	$	(0.10	)	$	(0.11	)
Year Ended December 31, 2019	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Revenue	$	—		$	—		$	—		$	—
Total operating expenses		13,621			14,753			13,448			16,036
Loss from operations		(13,621	)		(14,753	)		(13,448	)		(16,036	)
Non-cash inducement warrant expense		—			—			(60,751	)		—
Net income (loss) applicable to common shareholders		(13,434	)		(14,620	)		(73,996	)		(15,746	)
Net income (loss) per share, basic	$	(0.08	)	$	(0.09	)	$	(0.43	)	$	(0.09	)
Net income (loss) per share, diluted	$	(0.08	)	$	(0.09	)	$	(0.43	)	$	(0.09	)