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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
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, 2020, 2019, and 2018
| Balance at Beginning of Year |  | Provision (Release) for Bad Debts |  | Net Write-offs |  | Balance at End of Year
Accounts receivable allowance |  |  |  |  |  |  |
2020 | $ | 56 |  |  | $ | 191 |  |  | $ | (94) |  |  | $ | 153 |
2019 | 229 |  |  | (79) |  |  | (94) |  |  | 56 |
2018 | 259 |  |  | 142 |  |  | (172) |  |  | 229 |
| Years Ended December 31, 2020, 2019, and 2018
| Balance at Beginning of Year |  | Provision for Refunds |  | Refunds Issued |  | Balance at End of Year
Refund reserve |  |  |  |  |  |  |
2020 | $ | 554 |  |  | $ | 44,171 |  |  | $ | (43,210) |  |  | $ | 1,515 |
2019 | 396 |  |  | 24,987 |  |  | (24,829) |  |  | 554 |
2018 | 282 |  |  | 21,240 |  |  | (21,126) |  |  | 396 |
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 -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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