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Geographical Information (Tables)
 9 Months Ended
Jun. 30, 2018
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 June 30,
 
For the nine months ended June 30,
(in thousands)
 
2018
 
2017
 
2018
 
2017
United States
 
$
12,965

 
$
23,391

 
$
47,984

 
$
74,075

Asia
 
3,116

 
5,699

 
7,919

 
14,190

Europe
 
1,534

 
1,653

 
4,266

 
4,978

Other
 
102

 
209

 
207

 
476

Total revenue
 
$
17,717

 
$
30,952

 
$
60,376

 
$
93,719