Income Taxes (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) state	Sep. 30, 2014 USD ($) state	Sep. 30, 2015 USD ($) state	Sep. 30, 2014 USD ($) state	Dec. 31, 2014 USD ($)
Number Of States Owed A Tax Liability | state	1	1	1	1
Income tax expense	$ 5	$ 5	$ 15	$ 15
Interest and penalty payments	$ 0	$ 0	$ 0	$ 0
Internal Revenue Service (IRS) [Member]
Operating loss carryforwards, subject to expiration					$ 159,600
State and Local Jurisdiction [Member]
Operating loss carryforwards, subject to expiration					$ 143,900