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Financial Risk Management Objectives - Summary of Capital Management (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Objectives Policies And Processes For Managing Capital [Abstract]        
Interest bearing loans and borrowings $ 13,781 $ 11,356    
Trade and other payables 27,370 16,879    
Less: cash and cash equivalents (52,237) (53,673) $ (60,778) $ (46,093)
Net debt (11,086) (25,438)    
Total equity 234,875 228,435 $ 221,816 $ 222,733
Capital and net debt $ 223,789 $ 202,997    
Gearing ratio 0.00% 0.00%