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Segment Information and Foreign Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Segment Information [Abstract]
Number of operating segments									1
Revenue by product type [Abstract]
Net revenue	$ 18,927	$ 20,808	$ 25,153	$ 23,486	$ 21,219	$ 28,305	$ 30,031	$ 24,566	$ 88,374		$ 104,121		$ 95,493
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue	18,927	20,808	25,153	23,486	21,219	28,305	30,031	24,566	88,374		104,121		95,493
Long-lived assets by geographic region [Abstract]
Long-lived assets	37,235				34,282				37,235		34,282
North America [Member]
Revenue by product type [Abstract]
Net revenue									15,391	[1]	20,471	[1]	20,739	[1]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									15,391	[1]	20,471	[1]	20,739	[1]
Europe [Member]
Revenue by product type [Abstract]
Net revenue									18,170		21,082		18,838
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									18,170		21,082		18,838
Japan [Member]
Revenue by product type [Abstract]
Net revenue									9,346		13,749		11,857
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									9,346		13,749		11,857
Taiwan [Member]
Revenue by product type [Abstract]
Net revenue									10,985		9,813		14,834
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									10,985		9,813		14,834
Asia Pacific (excluding Japan and Taiwan) [Member]
Revenue by product type [Abstract]
Net revenue									34,482		39,006		29,225
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									34,482		39,006		29,225
China [Member]
Long-lived assets by geographic region [Abstract]
Long-lived assets	36,805				33,798				36,805		33,798
United States of America [Member]
Long-lived assets by geographic region [Abstract]
Long-lived assets	430				484				430		484
GaAs Substrates [Member]
Revenue by product type [Abstract]
Net revenue									51,368		63,697		67,591
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									51,368		63,697		67,591
InP Substrates [Member]
Revenue by product type [Abstract]
Net revenue									6,024		5,182		4,038
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									6,024		5,182		4,038
Ge Substrates [Member]
Revenue by product type [Abstract]
Net revenue									8,734		11,635		8,955
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									8,734		11,635		8,955
Raw materials [Member]
Revenue by product type [Abstract]
Net revenue									22,247		23,606		14,884
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									22,247		23,606		14,884
Other [Member]
Revenue by product type [Abstract]
Net revenue									1		1		25
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									$ 1		$ 1		$ 25
[1] Primarily the United States

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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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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Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

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