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Other Current Assets and Other Long-Term Assets
 3 Months Ended
Mar. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Current Assets and Other Long-Term Assets
Other current assets consisted of the following (in thousands):
March 31,December 31,
 20222021
Prepaid expenses$11,797 $11,895 
Deposits and other receivables3,036 2,235 
Interest receivables1,810 2,513 
$16,643 $16,643 
    
The other long-term assets balance of $20.6 million as of March 31, 2022 consisted of $20.0 million in deposits paid in connection 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 $19.0 million as of December 31, 2021 consisted of $18.4 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.