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Goodwill and intangible assets
9 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and intangible assets
5. Goodwill and intangible assets
There were no changes to the carrying value of goodwill as of September 30, 2018 and June 30, 2019. Total amortization expense related to intangible assets was less than $0.1 million for the three months ended June 30, 2018 and 2019, and $0.2 million for the nine months ended June 30, 2018 and 2019.
The intangible assets balances are presented below:
 
  
September 30, 2018
 
(in thousands, except for years)
 
Useful

life in

years
  
Gross

carrying

amount
  
Accumulated

amortization
  
Net book

value
 
Developed Technology
  6  $1,220  $(508 $712 
Tradenames & Trademarks
  2   20   (20  —   
      
 
 
  
 
 
  
 
 
 
Total indefinite-lived intangible assets
     $1,240  $(528 $712 
      
 
 
  
 
 
  
 
 
 
  
  
June 30, 2019
 
(in thousands, except for years)
 
Useful

life in

years
  
Gross

carrying

amount
  
Accumulated

amortization
  
Net book

value
 
Developed Technology
  6  $1,220  $(661 $559 
Tradenames & Trademarks
  2   20   (20  —   
      
 
 
  
 
 
  
 
 
 
Total indefinite-lived intangible assets
     $1,240  $(681 $559