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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2021
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, 2021, 2020 and 2019
 
Balance at Beginning of Year
Provision (Release) for Bad DebtsNet Write-offs
Balance at End of Year
Accounts receivable allowance    
2021$153 $57 $(57)$153 
202056 191 (94)153 
2019229 (79)(94)56 
 Years Ended December 31, 2021, 2020 and 2019
 
Balance at Beginning of Year
Provision for RefundsRefunds Issued
Balance at End of Year
Refund reserve    
2021$1,515 $58,553 $(58,676)$1,392 
2020554 44,171 (43,210)1,515 
2019396 24,987 (24,829)554 
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.