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Other Current Assets and Other Long-Term Assets
 9 Months Ended
Sep. 30, 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):
 September 30,December 31,
20202019
Prepaid expenses$8,892 $5,672 
Deposits and other receivables5,914 2,119 
Interest receivable1,535 1,566 
$16,341 $9,357 

The other long-term assets balance as of September 30, 2020 consisted of $6.0 million in deposits paid in conjunction with the Company's research and development activities, $0.6 million for an operating right-of-use asset for the Company's corporate headquarters, and $0.6 million for a security deposit in connection with the lease of the Company's future corporate headquarters. As of December 31, 2019, the other long-term assets balance consisted of $5.1 million in deposits paid in conjunction with the Company's research and development activities, $0.6 million for an operating right-of-use asset for the Company's corporate headquarters, and $0.3 million for a security deposit in connection with the lease of the Company's future corporate headquarters.