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Summary of Significant Accounting Policies (Detail) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Non-cash changes in inventory | $ 294 | $ 602
Research and Development Expense (in Dollars) | $ 2,362 | $ 2,984
Number of Years Defined Benefit Plans are Closed to Newly Hired Employees | 2 years |
Number of Years Supplementary Retirement Plans are Closed to Newly Hired Employees | 2 years |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) |  | 25
Stock-based compensation expense on stock options and restricted stock awards | $ 577 | $ 414
Minimum |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |
Property, Plant and Equipment, Useful Life | 3 years |
Hardware Warranty Included in Product Sales | 90 days |
Maximum |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |
Property, Plant and Equipment, Useful Life | 7 years |
Hardware Warranty Included in Product Sales | 3 years |
Systems Segment [Member] |  |
Royalty revenue | $ 5,400 | $ 4,300

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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