Segment Information (Tables)

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

Summary of Revenue by Geographic Region

The following table summarizes revenue by geographic region:

	Year Ended December 31,
	2016		2015
	(in thousands)
Germany	$	8,945	$	3,718
United States		3,364		4,894
Malaysia		2,880		—
Korea		1,486		3,646
Canada		876		522
Taiwan		847		3,490
Australia		509		913
Israel		398		785
China		222		5,499
Other		103		351
Total revenue	$	19,630	$	23,818

Summary of Sales by Product Type

The following table summarizes sales by product type:

	Year Ended December 31,
	2016		2015
	(in thousands)
Wafer	$	13,121	$	6,627
Optical		4,568		5,086
Core		1,652		11,444
Research & development		289		661
Total revenue	$	19,630	$	23,818

Summary of Assets by Geographic Region

The following table summarizes assets by geographic region:

	As of December 31,
	2016		2015
	(in thousands)
United States	$	47,171	$	88,916
Malaysia		5,811		30,276
Other		31		50
Total assets	$	53,013	$	119,242