Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Decrease in valuation allowance	$ 3,802,000
Net operating loss carryforwards, permanent loss of tax benefit			$ 1,900,000
Net operating loss carryforwards	32,226,000
Unrecognized tax benefits	0	$ 0
Unrecognized tax benefits, income tax penalties and interest accrued	0	0
Unrecognized tax benefits, income tax penalties and interest expense	0	$ 0
Increase in unrecognized tax benefits in next twelve months	0
Decrease in unrecognized tax benefits in next twelve months	$ 0