Prepaid Expenses and Other Current Assets
 12 Months Ended
Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaid Expenses and Other Current Assets
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in thousands):
 
As of December 31,
 
2015
 
2014
Prepaid expenses and advances
$
3,033

 
$
2,285

Security deposit
228

 
211

Interest receivable on marketable securities
361

 
537

Other current assets
150

 
443

Total
$
3,772

 
$
3,476