Segment Information (Tables)

3 Months Ended

Mar. 31, 2020

Segment Reporting [Abstract]

Schedule of geographic region

	Three months ended March 31,
	2020		2019
	(in thousands)
North America	$	1,040	$	862
Asia		113		48
Other		7		10
Total revenue	$	1,160	$	920

	Three months ended March 31,
	2020		2019
	(in thousands)
Optical	$	1,027	$	910
Core		—		10
Rubicon DTP		133		—
Total revenue	$	1,160	$	920

	As of March 31,		As of December 31,
	2020			2019
	(in thousands)
United States	$	26,105		$	29,703
Malaysia		4,992			5,094
Other		4			4
Total assets	$	31,101		$	34,801