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Supplemental Financial Information - Supplemental Income Statement, Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]        
Interest on Senior Term Loan $ 0 $ 339 $ 207 $ 1,453
Debt discount and debt issuance costs 0 355 946 1,064
453A interest 3 94 10 254
Other 83 93 253 282
Interest expense $ 86 $ 881 $ 1,416 $ 3,053