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Other current assets (Tables)
 6 Months Ended
Jun. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of other current 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