Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of quarterly financial data

The following table provides selected quarterly financial data for the years ended December 31, 2018 and 2017.

	Three Months Ended
	Mar. 31,		Jun. 30,		Sep. 30,		Dec. 31,		Mar. 31,		Jun. 30,		Sep. 30,		Dec. 31,
	2018		2018		2018		2018		2017		2017		2017		2017
Revenue	$	10,042	$	10,938	$	13,054	$	16,559	$	5,297	$	6,042	$	7,271	$	9,957
Gross profit	7,748		8,836		10,587		13,366		4,101		4,666		5,706		8,076
Net loss	(6,501)		(5,856)		(4,693)		(4,778)		(4,481)		(4,756)		(4,022)		(4,252)
Net loss per share, basic and diluted (1)	$	(5.05)	$	(0.43)	$	(0.22)	$	(0.22)	$	(3.90)	$	(4.14)	$	(3.42)	$	(3.46)

(1) The summation of quarterly per share amounts may not equal the calculation for the full year, as each quarterly calculation is performed discretely.