401(k) Savings Plan - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Contribution Plan Disclosure [Line Items]
Percent match	50.00%
Contributions to plan	$ 0.6	$ 0.5
Maximum
Defined Contribution Plan Disclosure [Line Items]
Maximum percent for match	6.00%