Segment Information and Foreign Operations (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segment	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments | segment			1
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	$ 18,371	$ 23,138	$ 59,445	$ 63,932
Long-lived assets by geographic region [Abstract]
Long-lived assets	32,346		32,346		$ 33,862
Taiwan [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	4,131	3,835	10,654	8,735
Reportable Geographical Components [Member] | Europe [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	4,385	5,429	14,992	16,980
Reportable Geographical Components [Member] | China [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	3,296	4,298	10,154	13,423
Long-lived assets by geographic region [Abstract]
Long-lived assets	31,648		31,648		33,726
Reportable Geographical Components [Member] | Japan [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	1,939	3,511	7,176	9,281
Reportable Geographical Components [Member] | Asia Pacific (Excluding Japan And Taiwan) [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	2,750	3,537	8,277	8,376
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	1,870	$ 2,528	8,192	$ 7,137
Long-lived assets by geographic region [Abstract]
Long-lived assets	$ 698		$ 698		$ 136