Note 9. Segment and Geographic Information (Detail) - Revenues by Geography (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues	$ 7,248	$ 7,470	$ 22,809	$ 23,480
North America [Member]
Revenues	5,181	5,884	16,001	17,967
Europe, Middle East and Africa [Member]
Revenues	671	644	2,480	3,355
Latin America [Member]
Revenues	794	550	2,276	1,438
Asia [Member]
Revenues	$ 602	$ 392	$ 2,052	$ 720