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v3.20.1

Detail of Selected Balance Sheet Accounts | 6 Months Ended
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Mar. 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 March 31, |  | Six months ended March 31,
| 2020 |  | 2019 |  | 2020 |  | 2019
Balance at beginning of period | $ | 346 |  |  | $ | 139 |  |  | $ | 301 |  |  | $ | 157 |
Bad debt expense | 9 |  |  | 74 |  |  | 51 |  |  | 101 |
Uncollectible accounts written off, net of recoveries | (45 | ) |  | (2 | ) |  | (55 | ) |  | (44 | )
Change due to foreign currency translation | (10 | ) |  | 3 |  |  | 3 |  |  | — |
Balance at end of period | $ | 300 |  |  | $ | 214 |  |  | $ | 300 |  |  | $ | 214 |
Inventories The components of inventories are summarized below (in thousands):
| March 31, 2020 |  | September 30, 2019
Raw materials, parts and sub-assemblies, net | $ | 30,512 |  |  | $ | 28,102 |
Work-in-progress | 624 |  |  | 1,100 |
Total inventories | $ | 31,136 |  |  | $ | 29,202 |
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,
| 2020 |  | 2019 |  | 2020 |  | 2019
Balance at beginning of period | $ | 3,162 |  |  | $ | 2,732 |  |  | $ | 2,946 |  |  | $ | 2,604 |
Increase in warranty expense | 784 |  |  | 881 |  |  | 1,627 |  |  | 1,627 |
Deduction for warranty charges | (670 | ) |  | (634 | ) |  | (1,315 | ) |  | (1,238 | )
Change due to foreign currency translation | — |  |  | 7 |  |  | 18 |  |  | (7 | )
Balance at end of period | $ | 3,276 |  |  | $ | 2,986 |  |  | $ | 3,276 |  |  | $ | 2,986 |

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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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