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Other Current Assets and Other Long-Term Assets
 9 Months Ended
Sep. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Current Assets and Other Long-Term Assets Other Current Assets and Other Long-Term 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 

The other long-term assets balance of $18.4 million as of September 30, 2021 consisted of $17.8 million in deposits paid in conjunction with the Company’s research and development activities, and $0.6 million for a letter of credit secured by restricted cash in connection with the lease of the Company’s corporate headquarters. The other long-term assets balance of $9.2 million as of December 31, 2020 consisted of $8.6 million in deposits paid in conjunction with the Company’s research and development activities, and $0.6 million for a letter of credit secured by restricted cash in connection with the lease of the Company’s corporate headquarters.