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Other Current Assets and Other Long-Term Assets (Tables)
9 Months Ended
Sep. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Other Current Assets
Other current assets consisted of the following (in thousands):
September 30,
2021
December 31,
2020
Prepaid expenses13,173 8,158 
Deposits and other receivables2,346 3,075 
Interest receivable1,957 2,304 
$17,476 $13,537