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Financial Risk Management Objectives - Summary of Capital Management (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Objectives Policies And Processes For Managing Capital [Abstract]        
Interest-bearing loans and borrowings $ 11,356 $ 24,814    
Trade and other payables 16,879 21,127    
Less: cash and cash equivalents (53,673) (60,778) $ (46,093) $ (48,231)
Net debt (25,438) (14,837)    
Total equity 228,435 221,816 $ 222,826 $ 197,175
Capital and net debt $ 202,997 $ 206,979    
Gearing ratio 0.00% 0.00%