Acquisition (Details) (USD $)					0 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Oct. 31, 2012 Etherios [Member]	Oct. 31, 2012 Maximum [Member]
Business Acquisition [Line Items]
Total purchase price					$ 20,500,000
Cash, including cash in escrow					13,696,000
Cash acquired					800,000
Common stock					6,804,000
Common stock issued per common share					9.508
Amount in escrow					2,350,000
Escrow holdback					300,000
Payable period					90 days
Escrow cash					2,050,000
Escrow cash period						18 months
Goodwill	$ 103,391,000	$ 86,209,000	$ 85,607,000	$ 86,012,000	$ 17,120,000