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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Other Commitments [Line Items] |  |  |
Unemployment benefits, possible liability with a change in control | $ 45,000 |  |
Unemployment benefits, possible liability without a change in control | 17,300 |  |
Maximum potential capital contributions | 22,500 |  |
Equity method investment | (7,000) | $ (2,500) |
Operating lease not yet commenced, future lease payments | $ 10,900 |  |
Operating lease not yet commenced, term of contract | 129 months |  |
Operating lease, advances for leasehold improvements | $ 1,600 |  |
WorkLLama |  |  |
Other Commitments [Line Items] |  |  |
Equity method investment | $ (7,000) |  | $ (4,000)
Minimum |  |  |
Other Commitments [Line Items] |  |  |
Period for providing minimum compensation salary and continuation of certain benefits to executives under employment agreements | 6 months |  |
Severance payment if agreement terminated meeting specific criteria, percentage of annual bonus | 50.00% |  |
Severance payment if agreement terminated meeting specific criteria, percentage of annual salary | 100.00% |  |
Renewal terms of current operating leases | 1 year |  |
Maximum |  |  |
Other Commitments [Line Items] |  |  |
Period for providing minimum compensation salary and continuation of certain benefits to executives under employment agreements | 3 years |  |
Severance payment if agreement terminated meeting specific criteria, percentage of annual bonus | 300.00% |  |
Severance payment if agreement terminated meeting specific criteria, percentage of annual salary | 300.00% |  |
Renewal terms of current operating leases | 5 years |  |

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