Segment Information (Tables)

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

Summary of Revenue by Geographic Region

The following table summarizes revenue by geographic region:

	Three months ended September 30,				Nine months ended September 30,
	2016		2015		2016		2015
	(in thousands)				(in thousands)
Germany	$	5,409	$	1,629	$	8,396	$	3,270
United States		911		1,332		2,717		3,853
Korea		414		1,267		1,478		3,254
Canada		114		—		537		518
Australia		91		300		503		715
Israel		63		104		355		718
Taiwan		38		305		847		3,218
China		5		320		8		5,484
Other		41		89		67		332
Total revenue	$	7,086	$	5,346	$	14,908	$	21,362

Summary of Revenue by Product Type

The following table summarizes revenue by product type:

	Three months ended September 30,				Nine months ended September 30,
	2016		2015		2016		2015
	(in thousands)				(in thousands)
Core	$	424	$	1,824	$	1,514	$	10,962
Wafer		5,507		2,136		9,683		5,769
Optical		1,075		1,116		3,422		4,075
Research & development		80		270		289		556
Total revenue	$	7,086	$	5,346	$	14,908	$	21,362

Summary of Assets by Geographic Region

The following table summarizes assets by geographic region:

	September 30, 2016		December 31, 2015
	(in thousands)
United States	$	61,148	$	88,916
Malaysia		16,531		30,276
Other		41		50
Total assets	$	77,720	$	119,242