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Other current assets and other long-term assets
3 Months Ended
Mar. 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):
 
March 31,
 
December 31,
 
2019
 
2018
Prepaid expenses
$
1,333

 
$
1,261

Deposits and other receivables
2,985

 
1,841

Interest receivables
792

 
768

Right-of-use asset
287

 

 
$
5,397

 
$
3,870



The other long-term assets balance consisted of $2.6 million and $1.3 million in deposits paid in conjunction with the Company's research and development activities as of March 31, 2019 and December 31, 2018, respectively.