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GOODWILL AND INTANGIBLE ASSETS
12 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND INTANGIBLE ASSETS GOODWILL AND INTANGIBLE ASSETS
Goodwill
The Company has goodwill balances of $34.4 million and $3.0 million at September 30, 2018 and 2017, respectively, representing the excess of costs over fair value of net assets of businesses acquired. Goodwill acquired in a business combination and determined to have an indefinite useful life is not amortized, but instead is tested for impairment at least annually in accordance with ASC Topic 350. The following table summarizes changes in the balance of goodwill during the year ended September 30, 2018 (amounts shown in thousands):

Balance at September 30, 2017 $3,014 
Acquisition of ICAR 6,936 
Acquisition of A2iA 24,867 
Foreign currency effect on goodwill (410)
Balance at September 30, 2018 $34,407 
Intangible assets
Intangible assets include the value assigned to completed technologies, customer relationships, and trade names. The estimated useful lives for all of these intangible assets, range from two to seven years. Intangible assets as of September 30, 2018 and 2017 are summarized as follows (amounts shown in thousands, except for years):
September 30, 2018: 
Weighted
Average
Amortization
Period
Cost
Accumulated
Amortization
Net
Completed technologies 6.4 years$20,341 $3,070 $17,271 
Customer relationships
4.8 years17,628 2,351 15,277 
Trade names 4.5 years618 219 399 
Total intangible assets
$38,587 $5,640 $32,947 

September 30, 2017: 
Weighted
Average
Amortization
Period
Cost
Accumulated
Amortization
Net
Completed technologies 6.0 years$2,370 $833 $1,537 
Customer relationships
6.0 years970 341 629 
Trade names 5.0 years230 99 131 
Total intangible assets
$3,570 $1,273 $2,297 
 
Amortization expense related to acquired intangible assets was $4.0 million, $0.6 million, and $0.6 million for fiscal years ended September 30, 2018, 2017, and 2016, respectively and is recorded in acquisition-related costs and expenses in the consolidated statements of operations.
The estimated future amortization expense related to intangible assets for each of the five succeeding fiscal years is expected to be as follows (amounts shown in thousands):
Estimated Future Amortization Expense
2019$7,219 
20206,594 
20216,318 
20225,909 
20233,879 
Thereafter3,028 
Total $32,947