Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits	$ 7,240	$ 5,496	$ 0
Gross amount of increases in unrecognized tax benefits for tax positions taken in current year	2,584	1,744	1,526
Gross amount of decreases in unrecognized tax benefits for tax positions taken in prior year			3,970
Gross amount of decreases in unrecognized tax benefits for tax positions taken in prior year	0	0
Unrecognized tax benefits	$ 9,824	$ 7,240	$ 5,496