Number of customers who represented significant share in the entity during the reporting period.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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 after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Publisher SEC

-Name Regulation S-X (SX)

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-Name Regulation S-X (SX)

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-Section 03

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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-Publisher FASB

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-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

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Segment Information and Foreign Operations (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($) Customer	Jun. 30, 2014 USD ($) Customer	Jun. 30, 2015 USD ($) Segment Customer	Jun. 30, 2014 USD ($) Customer	Dec. 31, 2014 USD ($) Customer
Segment Information [Abstract]
Number of operating segments \| Segment			1
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	$ 21,010	$ 21,449	$ 41,074	$ 40,794
Long-lived assets by geographic region [Abstract]
Long-lived assets	$ 33,366		$ 33,366		$ 33,862
Revenue [Member]
Revenue, Major Customer [Line Items]
Number of customers representing significant share \| Customer	1	0	0	0
Percentage share generated by major customers (in hundredths)	10.00%	10.00%	10.00%	10.00%
Accounts Receivable [Member]
Revenue, Major Customer [Line Items]
Number of customers representing significant share \| Customer	2				2
Major Customer One [Member] \| Accounts Receivable [Member]
Revenue, Major Customer [Line Items]
Percentage share generated by major customers (in hundredths)			11.00%		10.00%
Major Customer Two [Member] \| Accounts Receivable [Member]
Revenue, Major Customer [Line Items]
Percentage share generated by major customers (in hundredths)			11.00%		10.00%
Top Five Major Customers [Member] \| Revenue [Member]
Revenue, Major Customer [Line Items]
Number of customers representing significant share \| Customer	5	5	5	5
Percentage share generated by major customers (in hundredths)	37.00%	37.00%	36.00%	35.00%
Reportable Geographical Components [Member] \| Europe (primarily Germany) [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	$ 5,664	$ 4,968	$ 10,607	$ 11,551
Reportable Geographical Components [Member] \| China [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	3,561	4,960	6,858	9,125
Long-lived assets by geographic region [Abstract]
Long-lived assets	32,252		32,252		$ 33,726
Reportable Geographical Components [Member] \| Taiwan [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	3,414	2,785	6,523	4,900
Reportable Geographical Components [Member] \| North America (primarily the United States) [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	2,850	2,829	6,322	4,609
Long-lived assets by geographic region [Abstract]
Long-lived assets	1,114		1,114		$ 136
Reportable Geographical Components [Member] \| Asia Pacific (excluding China, Japan and Taiwan) [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	2,768	2,450	5,527	4,839
Reportable Geographical Components [Member] \| Japan [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	$ 2,753	$ 3,457	$ 5,237	$ 5,770