Segment Information (Tables)

12 Months Ended

Dec. 31, 2012

Segment Information [Abstract]

Summary of revenue by geographic region

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Korea	$	19,862	$	51,461	$	25,605
Australia		12,494		14		2
United States		11,104		12,253		6,520
France		8,482		359		69
Taiwan		5,663		50,006		31,914
China		3,839		3,877		1,084
Japan		2,999		11,362		10,745
Other		2,800		4,668		1,423
Revenue	$	67,243	$	134,000	$	77,362

Summary of revenue by product type

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Core	$	9,755	$	61,734	$	54,198
As-Cut		59		31		38
As-Ground		9		—		141
Polished		50,474		65,468		19,245
Optical		5,720		6,751		3,680
Other		1,226		16		60
Revenue	$	67,243	$	134,000	$	77,362

Summary of assets by geographic region

	As of December 31,
	2012		2011
	(in thousands)
United States	$	210,781	$	223,430
Malaysia		37,280		36,492
Japan		25		30
Taiwan		10		—
Total Assets	$	248,096	$	259,952