Leases - ROU Assets and Lease Liabilities - Operating Assets and Liabilities (Details) $ in Thousands	Sep. 30, 2021 USD ($)
ROU assets:
Non-current operating lease ROU assets	$ 27,629
Operating lease liabilities:
Current operating lease liabilities	8,037
Non-current operating lease liabilities	37,572
Total operating lease liabilities	$ 45,609
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses