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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 12 Months Ended
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May 31, 2017 | May 31, 2016 | May 31, 2015
Commitments and Contingencies Disclosure [Line Items] |  |  |
Environmental remediation expense, period of remediation, years | 5 years |  |
Estimated liability costs of remediation | $ 916,000 | $ 916,000 |
Estimated liability, measurement period, years | 15 years |  |
Estimated liability costs of remediation, current | $ 54,000 | 54,000 |
Royalty Expense | 2,659,000 | 1,969,000 | $ 2,189,000
Future minimum royalty payment for period, 2018 | 625,000 |  |
Future minimum royalty payment for period, 2019 | 659,000 |  |
Future minimum royalty payment for period, 2020 | 666,000 |  |
Future minimum royalty payment for period, 2021 | 674,000 |  |
Future minimum royalty payment for period, 2022 | 597,000 |  |
Office and Manufacturing facilities operating lease expense | 729,000 | $ 662,000 | $ 736,000
Future minimum rental payments for 2018 | 591,000 |  |
Future minimum rental payments for 2019 | 292,000 |  |
Future minimum rental payments for 2020 | 88,000 |  |
Future minimum rental payments for 2021 | 87,000 |  |
Future minimum rental payments for 2022 and later | 91,000 |  |
Minimum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Environmental remediation expense | 38,000 |  |
Maximum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Environmental remediation expense | $ 57,000 |  |

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