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Revenue
 3 Months Ended
Mar. 31, 2017
Revenue [Abstract]  
Revenue
Revenue
The Company differentiates revenue and cost of revenue based on whether the source of revenue is attributable to products or services. Revenue and cost of revenue by source are as follows (in thousands):
 
Three months ended March 31,
 
2017
 
2016
Revenue:
 
 
 
Products
$
78,514

 
$
61,999

Services
1,440

 
1,813

 
$
79,954

 
$
63,812

Cost of revenue:
 
 
 
Products
$
50,691

 
$
39,246

Services
934

 
424

Depreciation
587

 
348

 
$
52,212

 
$
40,018