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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) | Sep. 30, 2017 | Sep. 30, 2016
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Deferred Tax Assets: |  |
Accrued liabilities and reserves | $ 351,000 | $ 331,000
Allowance for doubtful accounts | 73,000 | 70,000
Inventory | 778,000 | 632,000
R&D tax credits carryforwards | 155,000 | 871,000
Stock-based compensation | 95,000 | 140,000
Net operating losses carryforwards | 58,000 | 73,000
Unrealized loss on investments |  | 85,000
Other | 48,000 | 62,000
Gross Deferred Tax Assets | 1,558,000 | 2,264,000
Deferred and Other Tax Liabilities: |  |
Domestic international sales corporation | (839,000) | (577,000)
Percentage of completion | (1,114,000) | (1,158,000)
Property and equipment | (694,000) | (683,000)
Unrealized gain on investments | (332,000) |
Unrecognized tax benefits | (150,000) | (150,000)
Other | (30,000) | (12,000)
Gross Deferred and Other Tax Liabilities | (3,159,000) | (2,580,000)
Net Deferred and Other Income Tax Liabilities | $ (1,601,000) | $ (316,000)

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