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Other Income (Expense), Net - Components of Other Income (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other Income and Expenses [Abstract] |  |  |
Rental income | $ 792,000 | $ 792,000 | $ 792,000
Interest income | 300,000 | 257,000 | 124,000
Foreign currency losses, net | (108,000) | (260,000) | 323,000
Gain on disposal of equipment | 38,000 | 57,000 | 14,000
Credit gains on available-for-sale securities | 4,000 | 7,000 | 11,000
Other | 40,000 | 21,000 | (2,000)
Total other income (expense), net | $ 1,066,000 | $ 874,000 | $ 1,262,000

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