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Other Long-Term Liabilities
 12 Months Ended
Dec. 31, 2022
Other Liabilities, Noncurrent [Abstract]  
Other Long-Term Liabilities Other Long-Term Liabilities
Other long-term liabilities consist of the following as of December 31, 2021 and 2022 (in thousands):
 December 31, 2021December 31, 2022
Contract liabilities, net of current portion$34,704 $36,540 
Asset retirement obligations9,122 6,283 
Other3,263 3,183 
Other long-term liabilities$47,089 $46,006 
Contract Liabilities
As discussed in Note 4, in connection with its student tuition contracts, the Company has an obligation to provide free classes in the future should certain eligibility conditions be maintained (the Graduation Fund). Long-term contract liabilities represent the amount of revenue under these arrangements that the Company expects will be realized after one year.
Asset Retirement Obligations
Certain of the Company’s lease agreements require the leased premises to be returned in a predetermined condition.