Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016 and 2015 (in thousands except per share amounts):

	Three Months Ended
	March 31, 2016			June 30, 2016			September 30, 2016			December 31, 2016
Product revenue	$	7,632		$	9,251		$	10,175		$	10,125
Gross profit on product revenue		3,369			4,275			4,724			4,520
Government contracts revenue		—			—			261			1,831
Net loss		(16,863	)		(18,166	)		(14,376	)		(13,501	)
Net loss per share:
Basic		(0.17	)		(0.18	)		(0.14	)		(0.13	)
Diluted		(0.17	)		(0.18	)		(0.14	)		(0.13	)

	Three Months Ended
	March 31, 2015			June 30, 2015			September 30, 2015			December 31, 2015
Product revenue	$	7,692		$	8,830		$	8,045		$	9,656
Gross profit on product revenue		2,978			1,802			2,485			3,494
Government contracts revenue		—			—			—			—
Net loss		(9,460	)		(15,972	)		(15,680	)		(14,756	)
Net loss per share:
Basic		(0.10	)		(0.17	)		(0.16	)		(0.15	)
Diluted		(0.17	)		(0.17	)		(0.17	)		(0.15	)