Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Taxes [Line Items]
Income tax benefit	$ 766	$ 116
Effective income tax rate (as a percent)	28.00%	14.00%
U.S. federal statutory rate (as a percent)	21.00%
State
Income Taxes [Line Items]
Net operating loss			$ 61,100
Tax credit carryforwards			2,800
Federal
Income Taxes [Line Items]
Net operating loss			57,100
Tax credit carryforwards			$ 6,400