Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income tax expense (benefit)	$ 39	$ 85
Effective income tax rate	(0.20%)	(0.40%)
Valuation allowance			$ 135,200