Quarterly Financial Summary (unaudited)

12 Months Ended

Dec. 31, 2021

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Summary (unaudited)

13. Quarterly Financial Summary (unaudited)

	Three Months Ended
	December 31,			September 30,			June 30,			March 31,
(in thousands, except per share data)	2021			2021			2021			2021
Product sales	$	—		$	—		$	—		$	—
Gross profit	$	130		$	—		$	—		$	—
Operating loss	$	(1,291	)	$	(2,503	)	$	(2,296	)	$	(2,843	)
Net loss	$	(1,283	)	$	(2,501	)	$	(2,294	)	$	(2,843	)
Net loss per share – basic and diluted	$	(0.03	)	$	(0.06	)	$	(0.08	)	$	(0.12	)

	Three Months Ended
	December 31,			September 30,			June 30,			March 31,
	2020			2020			2020			2020
Product sales	$	—		$	—		$	—		$	—
Gross profit	$	500		$	—		$	—		$	—
Operating loss	$	(1,274	)	$	(1,602	)	$	(3,116	)	$	(8,904	)
Net loss	$	(1,291	)	$	(1,603	)	$	(3,100	)	$	(8,886	)
Net loss per share – basic and diluted	$	(0.06	)	$	(0.07	)	$	(0.15	)	$	(0.57	)