Accrued Expenses (Schedule of Accrued Expenses) (Details) (USD $) In Thousands, unless otherwise specified	20 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jan. 31, 2011
Business Acquisition [Line Items]
Deferred distributor margin	$ 2,122	$ 2,547
Acquisition related liability	4,200	0
Other	4,811	2,164
Accrued expenses	11,133	4,711
Si En
Business Acquisition [Line Items]
Acquisition related liability	$ 4,200	$ 4,200	$ 4,200
Holdback provision period (years)	2 years