Commitments and Contingencies - Schedule of Lease Cost and Other Information (Details) ₩ in Thousands	9 Months Ended
	Sep. 30, 2019 KRW (₩)
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	₩ 103,372
Short-term lease cost	4,600
Total lease cost	107,972
Cash paid for amounts included in the measurement of lease liabilities	107,972
Operating cash flows from operating leases	₩ 107,972
Weighted-average remaining lease term - operating leases	2 years 6 months
Weighted-average discount rate - operating leases	5.73%