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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2015
Segment Reporting [Abstract]  
Schedule of Revenue by Geographic Region

 

 

 

 

 

 

 

 

 

 

 

 

 

Year ended December 31,

 

(in thousands)

   

2015

   

2014

   

2013

 

Revenue

 

 

 

 

 

 

 

 

 

 

United States

 

$
74,235

 

$
72,124

 

$
58,656

 

International

 

 
75,063

 

 
60,171

 

 
46,918

 

Total

 

$
149,298

 

$
132,295

 

$
105,574