Income Taxes - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Net operating losses expiration date	expire in 2022 and 2016
Intellectual Property
Operating Loss Carryforwards [Line Items]
Fair value of intellectual property		$ 11.0
Federal
Operating Loss Carryforwards [Line Items]
Income tax net operating loss carry forwards	$ 50.4	40.8
California
Operating Loss Carryforwards [Line Items]
Income tax net operating loss carry forwards	$ 50.4	$ 40.8