Subsequent Events (Details)	1 Months Ended			9 Months Ended
	Oct. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Apr. 30, 2013 USD ($)	Sep. 30, 2015 USD ($) item	Sep. 30, 2014 USD ($)
Line Of Credit-UBS
Subsequent Event [Line Items]
Borrowing capacity		$ 50,000,000		$ 50,000,000
Effective interest rate (as a percent)		0.84%		0.84%
Line Of Credit-UBS | Subsequent Event
Subsequent Event [Line Items]
Borrowings	$ 32,000,000
Secured Loan Arrangement
Subsequent Event [Line Items]
Borrowing capacity			$ 40,000,000
Borrowings			$ 20,000,000
Prepayment premium (as a percent)		10.00%		10.00%
Royalty expenses				$ 1,800,000	$ 1,400,000
Secured Loan Arrangement | Subsequent Event
Subsequent Event [Line Items]
Amount paid to extinguish debt	20,000,000
Debt paid off	28,000,000
Prepayment penalty	$ 2,000,000
Prepayment premium (as a percent)	10.00%
Royalty expenses	$ 6,000,000
30-day LIBOR | Line Of Credit-UBS
Subsequent Event [Line Items]
Spread on variable rate (as a percent)		0.65%
Austin TX, Short-term Lease | Subsequent Event
Subsequent Event [Line Items]
Term of lease	1 year
Monthly base rent	$ 12,900
Month-to-month base rent	12,900
Security deposit	12,900
Corporate Headquarters Lease
Subsequent Event [Line Items]
Number of subleases | item				2
Corporate Headquarters Lease | Subsequent Event
Subsequent Event [Line Items]
Security deposit	500,000
Maximum monthly base rent after escalation	400,000
Allowance for leasehold improvements	400,000
Period One | Corporate Headquarters Lease | Subsequent Event
Subsequent Event [Line Items]
Monthly base rent	200,000
Period Two | Corporate Headquarters Lease | Subsequent Event
Subsequent Event [Line Items]
Monthly base rent	300,000
Period Three | Corporate Headquarters Lease | Subsequent Event
Subsequent Event [Line Items]
Monthly base rent	$ 300,000