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Detail of Selected Balance Sheet Accounts | 6 Months Ended
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Mar. 31, 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 March 31, |  | Six months ended March 31,
| 2021 |  | 2020 |  | 2021 |  | 2020
Balance at beginning of period | $ | 493 |  |  | $ | 346 |  |  | $ | 510 |  |  | $ | 301 |
Bad debt expense (recovery), net | (113) |  |  | 9 |  |  | (132) |  |  | 51 |
Uncollectible accounts written off, net of recoveries | — |  |  | (45) |  |  | (10) |  |  | (55) |
Change due to foreign currency translation | 2 |  |  | (10) |  |  | 14 |  |  | 3 |
Balance at end of period | $ | 382 |  |  | $ | 300 |  |  | $ | 382 |  |  | $ | 300 |
Inventories The components of inventories are summarized below (in thousands):
| March 31, 2021 |  | September 30, 2020
Raw materials, parts and sub-assemblies, net | $ | 29,302 |  |  | $ | 27,429 |
Work-in-progress | 729 |  |  | 1,539 |
Total inventories | $ | 30,031 |  |  | $ | 28,968 |
Accrued Product Warranty Activity in our product warranty accrual consisted of the following (in thousands):
| Three months ended March 31, |  | Six months ended March 31,
| 2021 |  | 2020 |  | 2021 |  | 2020
Balance at beginning of period | $ | 2,675 |  |  | $ | 3,162 |  |  | $ | 2,771 |  |  | $ | 2,946 |
Increase to warranty expense | 395 |  |  | 784 |  |  | 1,053 |  |  | 1,627 |
Deduction for warranty charges | (609) |  |  | (670) |  |  | (1,388) |  |  | (1,315) |
Change due to foreign currency translation | 6 |  |  | — |  |  | 31 |  |  | 18 |
Balance at end of period | $ | 2,467 |  |  | $ | 3,276 |  |  | $ | 2,467 |  |  | $ | 3,276 |

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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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