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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2023
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts | Financial Statement Schedules Schedule II-Valuation and Qualifying Accounts (in thousands):
| Years Ended December 31, 2023, 2022, and 2021
| Balance at Beginning of Year |  | Provision for Bad Debts |  | Net Write-offs |  | Balance at End of Year
Accounts receivable allowance |  |  |  |  |  |  |
2023 | $ | 394 |  |  | $ | 58 |  |  | $ | (76) |  |  | $ | 376 |
2022 | 153 |  |  | 387 |  |  | (146) |  |  | 394 |
2021 | 153 |  |  | 57 |  |  | (57) |  |  | 153 |
| Years Ended December 31, 2023, 2022, and 2021
| Balance at Beginning of Year |  | Provision for Refunds |  | Refunds Issued |  | Balance at End of Year
Refund reserve |  |  |  |  |  |  |
2023 | $ | 1,499 |  |  | $ | 9,724 |  |  | $ | (9,685) |  |  | $ | 1,538 |
2022 | 1,392 |  |  | 21,129 |  |  | (21,022) |  |  | 1,499 |
2021 | 1,515 |  |  | 58,553 |  |  | (58,676) |  |  | 1,392 |
All other financial statement schedules are omitted because they are not applicable, or the information is included in the Registrant’s consolidated financial statements or related notes.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 + Details
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