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Financial Instruments - Summary of Carrying and Fair Value of Financial Instrument (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents $ 11,920 $ 7,091 $ 5,373
Trade receivables 11,292 11,259  
Other financial assets 288 35  
Carrying value [member]      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 11,920 7,091  
Trade receivables 11,292 11,259  
Other financial assets 11,659 2,491  
Other financial liabilities 57,198 56,718  
Fair value [member]      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 11,920 7,091  
Trade receivables 11,292 11,259  
Other financial assets 11,659 2,491  
Other financial liabilities $ 57,198 $ 56,718