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Income Taxes - Deferred Components of Benefit (Provision) for Income Taxes (Detail) - USD ($)
 12 Months Ended
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