Income Taxes - Additional Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Net operating losses expiration date	expire in 2022 and 2016
Intellectual Property
Income Taxes [Line Items]
Fair value of intellectual property		$ 11.0
Federal
Income Taxes [Line Items]
Income tax net operating loss carry forwards	42.7	40.8
California
Income Taxes [Line Items]
Income tax net operating loss carry forwards	42.7	$ 40.8