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Detail of Selected Balance Sheet Accounts | 9 Months Ended
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Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Detail of Selected Balance Sheet Accounts | Detail of Selected Balance Sheet Accounts Allowance for Credit Losses Activity in our allowance for credit losses consisted of the following (in thousands):
| Three months ended June 30, |  | Nine months ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Balance at beginning of period | $ | 382 |  |  | $ | 300 |  |  | $ | 510 |  |  | $ | 301 |
Bad debt expense, net | 326 |  |  | 136 |  |  | 194 |  |  | 187 |
Uncollectible accounts written off, net of recoveries | (168) |  |  | (2) |  |  | (178) |  |  | (57) |
Change due to foreign currency translation | 5 |  |  | — |  |  | 19 |  |  | 3 |
Balance at end of period | $ | 545 |  |  | $ | 434 |  |  | $ | 545 |  |  | $ | 434 |
Inventories The components of inventories are summarized below (in thousands):
| June 30, 2021 |  | September 30, 2020
Raw materials, parts and sub-assemblies, net | $ | 27,325 |  |  | $ | 27,429 |
Work-in-progress | 1,072 |  |  | 1,539 |
Total inventories | $ | 28,397 |  |  | $ | 28,968 |
Accrued Product Warranty Activity in our product warranty accrual consisted of the following (in thousands):
| Three months ended June 30, |  | Nine months ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Balance at beginning of period | $ | 2,467 |  |  | $ | 3,276 |  |  | $ | 2,771 |  |  | $ | 2,946 |
Increase to warranty expense | 515 |  |  | 276 |  |  | 1,568 |  |  | 1,904 |
Deduction for warranty charges | (557) |  |  | (555) |  |  | (1,970) |  |  | (1,826) |
Change due to foreign currency translation | 7 |  |  | 14 |  |  | 63 |  |  | (13) |
Balance at end of period | $ | 2,432 |  |  | $ | 3,011 |  |  | $ | 2,432 |  |  | $ | 3,011 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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