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Geographical Information (Tables)
 3 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Schedule of Revenue by Geographic Region
The following tables set forth revenue by geographic region with revenue assigned to geographic regions based on our customers’ billing address.

Revenue by Geographic Region
 
For the three months ended December 31,
(in thousands)
 
2017
 
2016
United States
 
$
20,079

 
$
24,754

Asia
 
2,657

 
3,719

Europe
 
1,227

 
1,630

Other
 
73

 
73

Total revenue
 
$
24,036

 
$
30,176