Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Other Commitments [Line Items]
Employer matching contributions	$ 0.8	$ 2.8	$ 3.1	$ 5.8
Purchase obligation	57.4		$ 57.4
Long-term purchase commitment, period			2 years
Accrued sales tax, including interest	1.0		$ 1.0
Letter of Credit | LOC for Security Deposit
Other Commitments [Line Items]
Letters of credit outstanding, amount	$ 1.1		$ 1.1
Match Step One
Other Commitments [Line Items]
Employer matching contribution, percent of match			100.00%
Employer matching contribution percent of eligible compensation			3.00%
Match Step Two
Other Commitments [Line Items]
Employer matching contribution, percent of match			50.00%
Employer matching contribution percent of eligible compensation			2.00%