Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Quarterly Unaudited Financial Data

The following tables summarize the Company’s quarterly financial information for the years ended December 31, 2019 and 2018 (in thousands except per share amounts):

	Three Months Ended
	March 31, 2019			June 30, 2019			September 30, 2019			December 31, 2019
Product revenue	$	17,504		$	18,209		$	18,019		$	20,917
Gross profit on product revenue		9,072			10,098			10,436			11,624
Government contract revenue		4,461			4,266			4,827			5,571
Net loss		(18,792	)		(17,562	)		(17,967	)		(16,923	)
Net loss per share:
Basic		(0.14	)		(0.13	)		(0.13	)		(0.12	)
Diluted		(0.14	)		(0.13	)		(0.13	)		(0.12	)

	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	)