Selected Quarterly Information (Unaudited)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Information (Unaudited)

17. Selected Quarterly Information (Unaudited)

        (in thousands, except per share amounts)

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	)
Year Ended December 31, 2018	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Revenue	$	146		$	—		$	—		$	—
Total operating expenses		16,342			12,378			12,570			12,762
Loss from operations		(16,196	)		(12,378	)		(12,570	)		(12,762	)
Preferred stock dividends		(5,120	)		(5,462	)		(6,074	)		(342	)
Settlement of a related party relationship		—			—			—			207,361
Net income (loss) applicable to common shareholders		(21,140	)		(17,493	)		(18,659	)		194,538
Net income (loss) per share, basic	$	(0.15	)	$	(0.12	)	$	(0.13	)	$	1.29
Net income (loss) per share, diluted	$	(0.15	)	$	(0.12	)	$	(0.13	)	$	1.29