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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Other Commitments [Line Items]        
Employer matching contributions $ 0.9 $ 0.8 $ 1.8 $ 1.7
Estimated sales tax liability, including interest, minimum   2.5   2.5
Estimated sales tax liability, including interest, maximum   6.3   6.3
Accrued sales tax, including interest 2.0 $ 2.5 2.0 $ 2.5
Letter of Credit | LOC for Security Deposit        
Other Commitments [Line Items]        
Letters of Credit Outstanding, Amount $ 0.6   $ 0.6  
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%