Segment Disclosure (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
Revenue Information by product line [Abstract]
Revenues	$ 29,064	[1]	$ 43,827	[1]	$ 110,219	[1]	$ 115,952	[1]
Systems [Member]
Revenue Information by product line [Abstract]
Revenues	17,806		29,171		74,526		73,053
Sub-systems [Member]
Revenue Information by product line [Abstract]
Revenues	$ 11,258		$ 14,656		$ 35,693		$ 42,899

[1] Includes related party amounts of $1,768 and $2,001 for the three months ended September 30, 2012 and 2011, respectively, and $3,527 and $4,969 for the nine months ended September 30, 2012 and 2011, respectively. See Note 11 for additional information on related par