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Income Taxes - Deferred Components of Benefit (Provision) for Income Taxes (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current benefit (provision) for income taxes: |  |  |
Total current benefit (provision) income taxes | $ (69,000) | $ 66,000 | $ (1,180,000)
Deferred benefit (provision) for income taxes: |  |  |
Total deferred benefit (provision) income taxes |  | (908,000) | 698,000
Total benefit (provision) for income taxes | (69,000) | (842,000) | (482,000)
Singapore [Member] |  |  |
Current benefit (provision) for income taxes: |  |  |
Total current benefit (provision) income taxes | (4,000) | 199,000 |
Deferred benefit (provision) for income taxes: |  |  |
Total deferred benefit (provision) income taxes |  | (134,000) | 134,000
Total benefit (provision) for income taxes | 0 | 0 | 0
Rest Of World [Member] |  |  |
Current benefit (provision) for income taxes: |  |  |
Total current benefit (provision) income taxes | $ (65,000) | (133,000) | (1,180,000)
Deferred benefit (provision) for income taxes: |  |  |
Total deferred benefit (provision) income taxes |  | $ (774,000) | $ 564,000

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