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Debt (Tables)
 9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Interest Expense
The following table sets forth the interest expense related to the 2026 Notes:
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
(in thousands)
Contractual interest expense$18 $— $18 $— 
Amortization of issuance costs95 — 95 —