Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax examination, likelihood of unfavorable settlement			Greater than 50 percent
Accrued interest or penalties	$ 0		$ 0		$ 0
Recognized interest or penalties	$ 0	$ 0	$ 0	$ 0