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Goodwill and Intangible Assets | 6 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND INTANGIBLE ASSETS | 4. GOODWILL AND INTANGIBLE ASSETS Goodwill The Company had a goodwill balance of $35.7 million at March 31, 2021, representing the excess of costs over fair value of 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 350. The following table summarizes changes in the balance of goodwill during the six months ended March 31, 2021 (amounts shown in thousands):
Balance at September 30, 2020 | $ | 35,669 |
Foreign currency effect on goodwill | 59 |
Balance at March 31, 2021 | $ | 35,728 |
Intangible Assets Intangible assets include the value assigned to purchased completed technology, 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 March 31, 2021 and September 30, 2020, respectively, are summarized as follows (amounts shown in thousands, except for years):
March 31, 2021: | Weighted Average Amortization Period |  | Cost |  | Accumulated Amortization |  | Net
Completed technologies | 6.4 years |  | $ | 20,341 |  |  | $ | 11,026 |  |  | $ | 9,315 |
Customer relationships | 4.8 years |  | 17,628 |  |  | 11,000 |  |  | 6,628 |
Trade names | 4.5 years |  | 618 |  |  | 517 |  |  | 101 |
Total intangible assets |  |  | $ | 38,587 |  |  | $ | 22,543 |  |  | $ | 16,044 |
September 30, 2020: | Weighted Average Amortization Period |  | Cost |  | Accumulated Amortization |  | Net
Completed technologies | 6.4 years |  | $ | 20,341 |  |  | $ | 9,416 |  |  | $ | 10,925 |
Customer relationships | 4.8 years |  | 17,628 |  |  | 9,390 |  |  | 8,238 |
Trade names | 4.5 years |  | 618 |  |  | 492 |  |  | 126 |
Total intangible assets |  |  | $ | 38,587 |  |  | $ | 19,298 |  |  | $ | 19,289 |
Amortization expense related to acquired intangible assets was $1.7 million and $1.6 million for the three months ended March 31, 2021 and 2020, respectively, and $3.4 million and $3.2 million during the six months ended March 31, 2021 and 2020, respectively, and is recorded within acquisition-related costs and expenses on the consolidated statements of operations and other comprehensive income (loss). 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
2021—remaining | $ | 3,104 |
2022 | 5,965 |
2023 | 3,915 |
2024 | 1,860 |
2025 | 1,200 |
Total | $ | 16,044 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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