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Geographical Information (Tables)
 6 Months Ended
Mar. 31, 2016
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 March 31,
 
For the six months ended March 31,
(in thousands)
2016
 
2015
 
2016
 
2015
United States
$
15,369

 
$
13,063

 
$
29,182

 
$
26,413

Asia
4,638

 
3,901

 
10,977

 
6,598

Europe
1,371

 
1,950

 
3,534

 
4,027

Other
154

 
143

 
329

 
435

Total revenue
$
21,532

 
$
19,057

 
$
44,022

 
$
37,473