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Segment and Significant Concentrations
 6 Months Ended
Jun. 30, 2016
Segment Reporting [Abstract]  
Segment and Significant Concentrations
Segment and Significant Concentrations
The Company and its wholly owned subsidiaries operate in one business segment.
The following table summarizes total revenue by type (in thousands): 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Revenue:
 
 
 
 
 
 
 
System and other revenue
$
24,838

 
$
24,360

 
$
49,122

 
$
43,074

Reagent and disposable revenue
121,163

 
108,115

 
241,659

 
222,038

Total revenue
$
146,001

 
$
132,475

 
$
290,781

 
$
265,112


The Company currently sells product through its direct sales force and through third-party distributors. No single customer or distributor accounted for more than 10% of total revenue for the three and six months ended June 30, 2016 and 2015.
The following table summarizes revenue by geographic region (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Geographic revenue information:
 
 
 
 
 
 
 
North America
$
81,202

 
$
76,187

 
$
163,592

 
$
158,492

International
64,799

 
56,288

 
127,189

 
106,620

Total revenue
$
146,001

 
$
132,475

 
$
290,781

 
$
265,112


The Company recognized revenue of $79.2 million and $72.6 million for sales to United States customers for the three months ended June 30, 2016 and 2015, respectively, and $158.9 million and $149.6 million for the six months ended June 30, 2016 and 2015, respectively.
No single country outside of the United States represented more than 10% of the Company’s total revenue for the three and six months ended June 30, 2016 and 2015.
The following table summarizes long-lived assets, excluding intangible assets and goodwill, by geographic region (in thousands):
 
June 30, 2016
 
December 31, 2015
United States
$
132,767

 
$
108,210

Other regions
19,232

 
19,429

Total long-lived assets
$
151,999

 
$
127,639


The Company does not hold a significant amount of long-lived assets in any single country outside of the United States as of June 30, 2016 and December 31, 2015.