Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Benefit from reduction in net deferred tax liability	$ 12,000,000.0
Federal statutory rate	21.00%	35.00%	35.00%
Valuation allowance	$ 27,331,000	$ 554,000	$ 554,000
Deferred tax assets, operating loss carryforwards, federal	2,400,000	0.0
Deferred tax assets, operating loss carryforwards, state	900,000	1,300,000
Unrecognized tax benefits that would affect effective tax rate	900,000	800,000	$ 300,000
Accrued interest related to unrecognized tax benefits	100,000	100,000
Interest expense related to unrecognized tax benefits	100,000	100,000
Accrued interest and penalties related to unrecognized tax benefits		0
Interest and penalties expense related to unrecognized tax benefits		0
Decrease in unrecognized tax benefits in next 12 months	400,000
Federal
Operating Loss Carryforwards [Line Items]
Income tax net operating loss carryforwards	11,400,000	200,000
State
Operating Loss Carryforwards [Line Items]
Income tax net operating loss carryforwards	$ 15,600,000	$ 21,900,000