Commitments and Contingencies - Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) lease	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Outstanding lease guarantees | $	$ 1.1
Self insurance program liability | $	$ 0.3	$ 0.3
Assignment and Assumption of Lease Agreements
Loss Contingencies [Line Items]
Number of leases assigned to purchasers | lease	21
Number of assignment agreements | lease	3