15. QUARTERLY FINANCIAL INFORMATION (Unaudited)

12 Months Ended

Dec. 31, 2022

The following table summarizes our unaudited quarterly financial information for the periods shown below (in thousands, except per share data):


	Fiscal Year 2022
	December 31,			September 30,			June 30,			March 31,
Revenue	$	—		$	—		$	314		$	350
Gross profit		(33	)		(45	)		296			346
Net loss		(13,475	)		(12,851	)		(13,597	)		(13,168	)
Net loss per share, basic and diluted		(0.08	)		(0.08	)		(0.08	)		(0.08	)



	Fiscal Year 2021
	December 31,			September 30,			June 30,			March 31,
Revenue	$	557		$	718		$	746		$	479
Gross profit		509			728			777			484
Net loss		(12,625	)		(9,382	)		(14,962	)		(6,231	)
Net loss per share, basic and diluted		(0.08	)		(0.06	)		(0.09	)		(0.04	)



	Fiscal Year 2020
	December 31,			September 30,			June 30,			March 31,
Revenue	$	395		$	639		$	587		$	1,469
Gross profit		395			639			588			70
Net loss		(3,570	)		(2,826	)		(2,304	)		(4,934	)
Net loss per share, basic and diluted		(0.02	)		(0.02	)		(0.02	)		(0.04	)