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Detail of Selected Balance Sheet Accounts | 3 Months Ended
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Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Detail of Selected Balance Sheet Accounts | Detail of Selected Balance Sheet Accounts Allowance for Doubtful Accounts Activity in our allowance for doubtful accounts consisted of the following (in thousands):
| Three months ended December 31, |  |
| 2020 |  | 2019 |  |  |  |
Balance at beginning of period | $ | 510 |  |  | $ | 301 |  |  |  |  |
Bad debt expense (recovery) | (19) |  |  | 42 |  |  |  |  |
Uncollectible accounts written off, net of recoveries | (10) |  |  | (10) |  |  |  |  |
Change due to foreign currency translation | 12 |  |  | 13 |  |  |  |  |
Balance at end of period | $ | 493 |  |  | $ | 346 |  |  |  |  |
Inventories The components of inventories are summarized below (in thousands):
| December 31, 2020 |  | September 30, 2020
Raw materials, parts and sub-assemblies, net | $ | 28,261 |  |  | $ | 27,429 |
Work-in-progress | 758 |  |  | 1,539 |
Total inventories | $ | 29,019 |  |  | $ | 28,968 |
Accrued Product Warranty Activity in our product warranty accrual consisted of the following (in thousands):
| Three months ended December 31, |  |
| 2020 |  | 2019 |  |  |  |
Balance at beginning of period | $ | 2,771 |  |  | $ | 2,946 |  |  |  |  |
Increase to warranty expense | 658 |  |  | 843 |  |  |  |  |
Deduction for warranty charges | (779) |  |  | (645) |  |  |  |  |
Change due to foreign currency translation | 25 |  |  | 18 |  |  |  |  |
Balance at end of period | $ | 2,675 |  |  | $ | 3,162 |  |  |  |  |

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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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