Income Taxes - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Operating Loss Carryforwards [Line Items]
Adjustment of deferred tax (asset) liability	$ 5.4
Unrecognized tax benefits that would impact effective tax rate	0.7
State
Operating Loss Carryforwards [Line Items]
State tax net operating losses	$ 6.1