"We may from time to time, depending on market conditions and prices, contractual restrictions, our financial liquidity and other factors, seek to repurchase the 2024 Notes in open market transactions, privately negotiated transactions, by tender offer or otherwise, as market conditions warrant.
As described above, on September 10, 2021, we exchanged $112.8 million of the 2024 Notes for $114.7 million of newly issued 2028 Notes, reflecting a call premium of 1.688%. Bond issuance costs of $1.1 million associated with the $112.8 million of the 2024 Notes are being amortized as part of the effective yield on the 2028 Notes.
On September 24, 2021, we repurchased $4.7 million of the 2024 Notes for $4.7 million in cash, recognizing a net loss of $56,000 after adjusting for bond issuance costs.
Based on the balance of the 2024 Notes outstanding of $98.8 million, we are required to pay $6.6 million per year in interest on the 2024 Notes. As of September 30, 2021, accrued interest on the 2024 Notes was $2.3 million.