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Other current assets and other long-term assets
6 Months Ended
Jun. 30, 2017
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,
 
2017
 
2016
 

 
 
Prepaid expenses
$
3,347

 
$
1,879

Deposits and other receivables
853

 
759

Interest receivable
239

 
183

 
$
4,439

 
$
2,821



The other long-term assets balance consisted of $2.1 million and $3.3 million in deposits paid in conjunction with the Company's research and development activities as of June 30, 2017 and December 31, 2016, respectively.