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Other Current Assets and Other Long-Term Assets
 12 Months Ended
Dec. 31, 2019
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,
 
2019
 
2018
Prepaid expenses
$
5,672

 
$
1,261

Deposits and other receivables
2,119

 
1,841

Interest receivables
1,566

 
768

 
$
9,357

 
$
3,870


    
The other long-term assets balance as of December 31, 2019 consists 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. As of December 31, 2018, the other long-term assets balance consisted of $1.3 million in deposits paid in conjunction with the Company's research and development activities.