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Other current assets and other long-term assets
6 Months Ended
Jun. 30, 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):
 
June 30,
 
December 31,
 
2019
 
2018
Prepaid expenses
$
5,893

 
$
1,261

Deposits and other receivables
3,246

 
1,841

Interest receivable
840

 
768

Right-of-use asset
204

 

 
$
10,183

 
$
3,870



The other long-term assets balance consisted of $5.3 million and $1.3 million in deposits paid in conjunction with the Company's research and development activities as of June 30, 2019 and December 31, 2018, respectively.