Segment Information (Tables)

9 Months Ended

Sep. 30, 2020

Segment Reporting [Abstract]

Schedule of geographic region

	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
	(in thousands)				(in thousands)
North America	$	1,014	$	561	$	3,188	$	2,120
Asia		91		14		359		134
Other		13		8		21		18
Total revenue	$	1,118	$	583	$	3,568	$	2,272

	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
	(in thousands)				(in thousands)
Optical	$	892	$	520	$	3.009	$	2,178
Direct Dose Rx		226		63		559		94
Total revenue	$	1,118	$	583	$	3,568	$	2,272

	As of September 30,		As of December 31,
	2020		2019
	(in thousands)
North America	$	30,381	$	29,703
Asia		710		5,094
Other		—		4
Total assets	$	31,091	$	34,801