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Other current assets and other long-term assets
9 Months Ended
Sep. 30, 2018
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,
 
2018
 
2017
 

 
 
Prepaid expenses
$
1,727

 
$
3,085

Deposits and other receivables
1,287

 
1,600

Interest receivable
472

 
237

 
$
3,486

 
$
4,922



The other long-term assets balance consisted of $1.2 million and $1.0 million in deposits paid in conjunction with the Company's research and development activities as of September 30, 2018 and December 31, 2017, respectively.