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Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

The following tables summarize the Company’s quarterly financial information for the years ended December 31, 2018 and 2017 (in thousands except per share amounts):

	Three Months Ended
	March 31, 2018			June 30, 2018			September 30, 2018			December 31, 2018
Product revenue	$	13,564		$	15,420		$	15,399		$	16,525
Gross profit on product revenue		6,234			7,700			7,257			8,083
Government contract revenue		3,455			4,047			3,928			3,713
Net loss		(13,885	)		(13,282	)		(14,192	)		(16,205	)
Net loss per share:
Basic		(0.11	)		(0.10	)		(0.11	)		(0.12	)
Diluted		(0.11	)		(0.10	)		(0.11	)		(0.12	)

	Three Months Ended
	March 31, 2017			June 30, 2017			September 30, 2017			December 31, 2017
Product revenue	$	7,006		$	9,525		$	10,797		$	16,240
Gross profit on product revenue		3,312			5,165			5,449			7,111
Government contract revenue		1,428			1,667			2,285			2,378
Net loss		(18,598	)		(17,083	)		(13,418	)		(11,486	)
Net loss per share:
Basic		(0.18	)		(0.16	)		(0.12	)		(0.10	)
Diluted		(0.18	)		(0.16	)		(0.12	)		(0.10	)