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Detail of Selected Balance Sheet Accounts | 9 Months Ended
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Jun. 30, 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 June 30, |  | Nine months ended June 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Balance at beginning of period | $ | 300 |  |  | $ | 214 |  |  | $ | 301 |  |  | $ | 157 |
Bad debt expense | 136 |  |  | 25 |  |  | 187 |  |  | 126 |
Uncollectible accounts written off, net of recoveries | (2 | ) |  | (31 | ) |  | (57 | ) |  | (74 | )
Change due to foreign currency translation | — |  |  | (3 | ) |  | 3 |  |  | (4 | )
Balance at end of period | $ | 434 |  |  | $ | 205 |  |  | $ | 434 |  |  | $ | 205 |
Inventories The components of inventories are summarized below (in thousands):
| June 30, 2020 |  | September 30, 2019
Raw materials, parts and sub-assemblies, net | $ | 30,481 |  |  | $ | 28,102 |
Work-in-progress | 1,182 |  |  | 1,100 |
Total inventories | $ | 31,663 |  |  | $ | 29,202 |
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,
| 2020 |  | 2019 |  | 2020 |  | 2019
Balance at beginning of period | $ | 3,276 |  |  | $ | 2,986 |  |  | $ | 2,946 |  |  | $ | 2,604 |
Increase in warranty expense | 276 |  |  | 945 |  |  | 1,904 |  |  | 2,572 |
Deduction for warranty charges | (555 | ) |  | (754 | ) |  | (1,826 | ) |  | (1,992 | )
Change due to foreign currency translation | 14 |  |  | 3 |  |  | (13 | ) |  | (4 | )
Balance at end of period | $ | 3,011 |  |  | $ | 3,180 |  |  | $ | 3,011 |  |  | $ | 3,180 |

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- References No definition available. + Details
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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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