Segment and Geographic Information (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Schedule of Product Revenue Based on Location

The following table represents the Company’s product revenue based on the location to which the product is shipped:

	Three Months Ended March 31,
	2019		2018
	(in thousands)
United States	$	3,636	$	897
Germany		643		254
Rest of Europe		2,736		129
All other countries		254		42
Product revenue	$	7,269	$	1,322