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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of tangible and intangible assets (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]      
Impairment loss recognised in profit or loss (note 4.6) $ 720,000 $ 306,000 $ 4,708,000
Other operating income (expense) [1] (720,000) (306,000) (4,708,000)
Licenses and internal developments | Internally generated      
Disclosure of detailed information about intangible assets [line items]      
Impairment loss recognised in profit or loss (note 4.6) $ 720,000 $ 306,000 $ 0
[1] Includes an impairment of intangibles assets of 720, 306 (note 4.6) and 4,708 (note 4.10) for 2019, 2018 and 2017, respectively.