Commitment and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
San Diego Gross Rental Payments [Member]
The Company's minimum commitments under non-cancelable operating leases
October 2012-September 2013	$ 528
October 2013-September 2014	2,545
October 2014-September 2015	2,617
October 2015-September 2016	2,691
October 2016-September 2017	2,768
Thereafter	15,607
Total minimum lease payments	26,756
Equipment Loan [Member]
The Company's minimum commitments under non-cancelable operating leases
October 2012-September 2013	401
October 2013-September 2014	437
October 2014-September 2015	437
October 2015-September 2016	437
October 2016-September 2017	437
Thereafter	2,258
Total minimum lease payments	4,407
Cambridge Net Rental Payments [Member]
The Company's minimum commitments under non-cancelable operating leases
October 2012-September 2013	196
October 2013-September 2014	31
October 2014-September 2015	0
October 2015-September 2016	0
October 2016-September 2017	0
Thereafter	0
Total minimum lease payments	$ 227