Commitments and Contingencies - Litigation (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Aug. 06, 2019 lawsuit
U S District Court of Delaware Cases
Commitments and Contingencies
Number of lawsuits | lawsuit		2
Class Action and the PAGA Action
Commitments and Contingencies
Reserve for estimated losses | $	$ 4.0
Maximum
Commitments and Contingencies
Period for severance pay beyond termination date	1 year