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Business Segments, Concentration of Credit Risk and Significant Customers (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Item	Dec. 31, 2011	Dec. 31, 2010
Business Segments, Concentration of Credit Risk and Significant Customers
Number of business segments	1
Number of measurements of profitability	1
Business Segments
Revenues	$ 6,082	$ 14,107	$ 15,563
Net property and equipment	1,238	1,382
United States
Business Segments
Revenues	2,511	5,476	5,886
Net property and equipment	1,114	1,216
Taiwan
Business Segments
Revenues	1,700	3,197	2,888
Japan
Business Segments
Revenues	1,571	4,700	6,661
Europe
Business Segments
Revenues	86	727
Rest of Asia
Business Segments
Revenues	214	7	128
Non-U.S.
Business Segments
Net property and equipment	$ 124	$ 166

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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