Geographic Information and Major Customer Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Summary information about geographic areas:
Total revenues	$ 12,006	$ 14,847	$ 40,710	$ 44,287
United States [Member]
Summary information about geographic areas:
Total revenues	2,454	4,810	8,631	11,362
Europe and Middle East [Member]
Summary information about geographic areas:
Total revenues	3,345	3,967	10,435	15,272
Asia Pacific [Member]
Summary information about geographic areas:
Total revenues	6,207	6,070	21,644	17,653
Germany [Member]
Summary information about geographic areas:
Total revenues	1,627	2,182	5,026	9,925
Switzerland [Member]
Summary information about geographic areas:
Total revenues				4,496
Taiwan [Member]
Summary information about geographic areas:
Total revenues		1,677
China [Member]
Summary information about geographic areas:
Total revenues	4,380	3,615	13,674	9,951
Japan [Member]
Summary information about geographic areas:
Total revenues			$ 4,323