Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ (10,000)	$ 12,000	$ 35,000	$ 42,000
Current income tax expense			32,000	73,000
Decrease to net deferred tax assets			$ (3,000)
Total deferred tax benefit				$ 31,000