Summary of Significant Accounting Policies (Segment Reporting) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013 segment	Sep. 30, 2012	Sep. 30, 2011
Accounting Policies [Abstract]
Number of operating segment									1
Summary of Significant Accounting Policies
Revenues	$ 10,853	$ 9,362	$ 8,548	$ 6,771	$ 6,319	$ 5,689	$ 5,185	$ 4,488	$ 35,534	$ 21,681	$ 10,514
Redeemable Preferred Stock, Series A-1 [Member]
Summary of Significant Accounting Policies
Preferred stock conversion ratio									0.3521126761
Series A-2 Preferred Stock [Member]
Summary of Significant Accounting Policies
Preferred stock conversion ratio									0.3521126761
Activity-Driven [Member]
Summary of Significant Accounting Policies
Revenues									28,134	19,064	9,875
Organization Driven [Member]
Summary of Significant Accounting Policies
Revenues									$ 7,400	$ 2,617	$ 639
Consolidated revenues [Member] | Customer concentration risk [Member] | Customer one [Member]
Summary of Significant Accounting Policies
Concentration risk (as a percent)									8.80%	10.80%	13.40%
Accounts receivable [Member] | Customer concentration risk [Member]
Summary of Significant Accounting Policies
Number of customers									0	0
United States [Member] | Consolidated revenues [Member] | Geographic concentration risk [Member]
Summary of Significant Accounting Policies
Concentration risk (as a percent)									89.80%	89.90%	90.10%