Goodwill and Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Intangible assets
Gross Carrying Amount	$ 8,058	$ 7,965
Accumulated Amortization	(6,350)	(4,540)
Net Carrying Amount	1,708	3,425
Acquired technology [Member]
Intangible assets
Gross Carrying Amount	4,094	4,021
Accumulated Amortization	(2,935)	(2,023)
Net Carrying Amount	1,159	1,998
Database [Member]
Intangible assets
Gross Carrying Amount	1,900	1,900
Accumulated Amortization	(1,821)	(1,441)
Net Carrying Amount	79	459
Customer relationships [Member]
Intangible assets
Gross Carrying Amount	2,064	2,044
Accumulated Amortization	(1,594)	(1,076)
Net Carrying Amount	$ 470	$ 968