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Royalties - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) LicenseAgreement | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract] |  |  |
Royalty expense | $ | $ 86 | $ 81 | $ 83
Number of license agreements minimum annual royalty | 2 |  |
Number of license agreements royalty percentage of annual sales | 2 |  |

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- Definition Number of additional licensing agreements. + References No definition available. + Details
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- Definition Number of Licensing Agreements That Require Minimum Annual Royalty Payments. + References No definition available. + Details
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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