Segment Information and Foreign Operations (Tables)

3 Months Ended

Mar. 31, 2014

Segment Information and Foreign Operations [Abstract]

The following table represents revenue amounts (in thousands) by product type:

	Three Months Ended March 31,
	2014		2013
Product type:
GaAs substrates	$	8,488	$	11,723
InP substrates		2,180		1,849
Ge substrates		3,278		2,551
Raw materials and other		5,399		6,257
Total	$	19,345	$	22,380

Revenue reported for products shipped to customers in the corresponding geographic region

The following table represents revenue amounts (in thousands) reported for products shipped to customers in the corresponding geographic region:

	Three Months Ended March 31,
	2014		2013
Geographical information:
Europe (primarily Germany)	$	6,583	$	4,689
China		4,165		6,029
Asia Pacific (excluding China, Japan and Taiwan)		2,389		2,132
Taiwan		2,115		3,779
Japan		2,313		2,282
North America (primarily the United States)		1,780		3,469
Total	$	19,345	$	22,380

Long-lived assets by geographic region

Long-lived assets consist primarily of property, plant and equipment, and are attributed to the geographic location in which they are located. Long-lived assets by geographic region were as follows (in thousands):

	As of
	March 31,		December 31,
	2014		2013
Long-lived assets by geographic region:
North America	$	179	$	204
China		36,000		37,417
	$	36,179	$	37,621