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 provision	$ 0	$ 0	$ 0	$ 0
Net deferred tax assets	6,031,000	6,900,000	6,031,000	6,900,000	$ 5,933,000
Valuation allowance	11,400,000	11,800,000	11,400,000	11,800,000
Accrued interest or penalties associated with unrecognized tax benefits	0		0
Interest expense recognized	$ 0	$ 0	$ 0	$ 0