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Other Income (Expense), Net - Components of Other Income (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Income and Expenses [Abstract] |  |  |
Rental income, net | $ 792,000 | $ 792,000 | $ 792,000
Foreign currency gains (losses), net | 181,000 | (108,000) | (260,000)
Interest income | 95,000 | 300,000 | 257,000
Gain on disposal of equipment | 13,000 | 38,000 | 57,000
Credit gains on available-for-sale securities | 4,000 | 4,000 | 7,000
Other | 8,000 | 40,000 | 21,000
Total other income (expense), net | $ 1,093,000 | $ 1,066,000 | $ 874,000

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