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Leases - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Lessee, Lease, Description [Line Items]          
Long-term lease liabilities $ 4,441   $ 4,441   $ 5,526
Operating lease, liability 6,900   6,900   3,000
Finance lease, right of use asset 1,900   1,900   2,400
Operating lease, right of use asset $ 6,399   $ 6,399   $ 1,930
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other long-term assets, net   Other long-term assets, net   Other long-term assets, net
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other current liabilities Other current liabilities Other current liabilities Other current liabilities Other current liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other long-term liabilities   Other long-term liabilities   Other long-term liabilities
Operating lease, expense $ 1,100 $ 1,100 $ 3,100 $ 3,500  
General and Administrative Expense          
Lessee, Lease, Description [Line Items]          
Operating lease, expense 100 100 400 600  
Consumables          
Lessee, Lease, Description [Line Items]          
Operating lease, expense $ 1,000 $ 1,000 $ 2,700 $ 2,900