Commitments Schedule of Future Minimum Rental Payments for Operating Leases (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Unrecorded Unconditional Purchase Obligation [Line Items]
2012 (remaining six months)	$ 329,000
2013	1,461,000
2014	1,474,000
2015	1,480,000
2016	440,000
2017 and beyond	30,000
Total minimum lease payments	5,214,000
Inventories
Unrecorded Unconditional Purchase Obligation [Line Items]
Non-cancelable purchase commitment with a third party manufacturer to purchase inventory	$ 4,200,000	$ 4,900,000