Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
NOLs utilized	$ 10.2
Research and development credit carryforwards	4.2
Alternate minimum tax expense on uncertain tax position	3.0	$ 0.6
Tax expense on uncertain tax positions	0.2	$ 0.3
U.S. Federal
Operating Loss Carryforwards [Line Items]
NOL carryforwards	10.8
State
Operating Loss Carryforwards [Line Items]
NOL carryforwards	$ 9.9