Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Other Commitments [Line Items]
Employer matching contributions	$ 0.9	$ 1.4	$ 2.3	$ 3.0
Accrued sales tax, including interest	1.8		1.8
Letter of Credit | LOC for Security Deposit
Other Commitments [Line Items]
Letters of Credit Outstanding, Amount	$ 0.7		$ 0.7
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%