Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011
summarizes revenue by geographic region
Total revenue	$ 6,219	$ 7,757	$ 5,928	$ 6,185	$ 6,677	$ 7,090	$ 5,525	$ 5,930	$ 26,090	$ 25,222
United States [Member]
summarizes revenue by geographic region
Total revenue									20,014	19,231
Europe and Middle East [Member]
summarizes revenue by geographic region
Total revenue									3,189	3,311
Asia [Member]
summarizes revenue by geographic region
Total revenue									1,740	1,161
Other [Member]
summarizes revenue by geographic region
Total revenue									$ 1,147	$ 1,519