Segment Information (Tables)

3 Months Ended

Mar. 31, 2017

Segment Information [Abstract]

Summary of revenue by geographic region

	Three months ended March 31,
	2017		2016
	(in thousands)
United States	$	796	$	1,111
Israel		216		171
Korea		—		422
Australia		—		412
Canada		203		233
Germany		12		1,538
Other		42		400
Revenue	$	1,269	$	4,287

Summary of revenue by product type

	Three months ended March 31,
	2017		2016
	(in thousands)
Optical	$	1,218	$	1,404
Core		15		441
Wafer		10		2,345
Research & development		26		97
Revenue	$	1,269	$	4,287

Summary of assets by geographic region

	March 31, 2017		December 31, 2016
	(in thousands)
United States	$	42,868	$	47,171
Malaysia		5,466		5,811
Other		17		31
Total assets	$	48,351	$	53,013