Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS (Details 1)

v3.21.2
INVESTMENTS (Details 1) - Valuation Technique Binomial Monte-Carlo Cliquet Option Pricing Model [Member]
₩ / shares in Units, ₩ in Billions
9 Months Ended 12 Months Ended
Sep. 30, 2021
$ / shares
Dec. 31, 2020
$ / shares
Sep. 30, 2021
KRW (₩)
₩ / shares
Dec. 31, 2020
KRW (₩)
₩ / shares
Schedule Of Investments [Line Items]        
Principal outstanding (South Korean won) | ₩     ₩ 30 ₩ 30
Stock price | (per share)   $ 1.23 ₩ 3,990 ₩ 6,060
Conversion price | $ / shares   $ 2.00    
Expected Life (in years) [Member]        
Schedule Of Investments [Line Items]        
Expected life (in years) 9 years 14 days 9 years 9 months 14 days    
Selected Yield [Member]        
Schedule Of Investments [Line Items]        
Investment in convertible bonds, measurement input     10.50 10.50
Expected Volatility (Telcon common stock) [Member]        
Schedule Of Investments [Line Items]        
Investment in convertible bonds, measurement input     82.15 85.80
Risk-free Interest Rate (South Korea government bond) [Member]        
Schedule Of Investments [Line Items]        
Investment in convertible bonds, measurement input     2.18 1.72
Conversion Price [Member]        
Schedule Of Investments [Line Items]        
Conversion price | (per share) $ 3.47 $ 5.54 ₩ 4,110 ₩ 6,028