Non-Controlling Interest-Issuance of Preferred Stock by Subsidiaries (Details) - Redeemable Convertible Preferred Stock [Member] - Subsidiaries [Member]	Nov. 22, 2021 KRW (₩) ₩ / shares shares	Apr. 09, 2019 KRW (₩) ₩ / shares shares
I-ON, Ltd. [Member]
Non-Controlling Interest-Issuance of Preferred Stock by Subsidiary [Abstract]
Proceeds from issuance of redeemable convertible preferred stock | ₩		₩ 549,997,000
Shares issued (in shares) | shares		157,142
Price per share (in dollars per share)		₩ 3,500
Ratio of voting rights of preferred stock to common stock		1
Annual dividend		2.00%
Conversion price (in dollars per share)		₩ 3,500
Call option premium		7.00%
e.form Works Co., Ltd. [Member]
Non-Controlling Interest-Issuance of Preferred Stock by Subsidiary [Abstract]
Proceeds from issuance of redeemable convertible preferred stock | ₩	₩ 733,270,800
Shares issued (in shares) | shares	443,600
Price per share (in dollars per share)	₩ 1,653
Ratio of voting rights of preferred stock to common stock	1
Annual dividend	1.00%
Conversion price (in dollars per share)	₩ 1,653
Call option premium	6.00%