XML 41 R169.htm IDEA: XBRL DOCUMENT v3.20.1
Cash Flow Information - Summary of Investing Activities with Partial Cash Payments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Investing Activities With Partial Cash Payments [Abstract]      
Acquisition of property, plant and equipment $ 3,406 $ 4,498  
Add: Payable for PPE or CIP - Opening 213 311  
Less: Payable for PPE or CIP - Ending (355) (213)  
Less: Prepayment for PPE & CIP - Opening (210) (304)  
Add: Prepayment for PPE & CIP - Ending 2,388 210  
Less: acquisition by means of a lease   (61)  
Cash paid during the year $ 5,442 $ 4,441 $ 4,903