Segment Information (Tables)

3 Months Ended

Mar. 31, 2013

Segment Information [Abstract]

Summary of revenue by geographic region

	Three months ended March 31,
	2013		2012
	(in thousands)
Australia	$	5,406	$	1,116
China		959		851
United States		915		2,125
Korea		570		—
Taiwan		39		1,693
France		28		2,751
Other		390		1,671
Revenue	$	8,307	$	10,207

Summary of revenue by product type

	Three months ended March 31,
	2013		2012
	(in thousands)
Core	$	987	$	2,758
Polished		6,057		5,681
Optical		1,144		1,759
Other		119		9
Revenue	$	8,307	$	10,207

Summary of assets by geographic region

	March 31, 2013		December 31, 2012
	(in thousands)
United States	$	196,821	$	210,781
Malaysia		37,099		37,280
Other		32		35
Total Assets	$	233,952	$	248,096