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Other Current Assets and Other Long-Term Assets
 12 Months Ended
Dec. 31, 2020
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):
December 31,
 20202019
Prepaid expenses$8,158 $5,672 
Deposits and other receivables3,075 2,119 
Interest receivables2,304 1,566 
$13,537 $9,357 
    
The other long-term assets balance of $9.2 million as of December 31, 2020 consisted of $8.6 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 $5.4 million as of December 31, 2019 consisted of $5.1 million in deposits paid in conjunction with the Company's research and development activities, and $0.3 million for a letter of credit secured by restricted cash in connection with the lease of the Company's corporate headquarters