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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% |

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