Consolidated Statements of Changes in Stockholders' Deficit - KRW (₩) ₩ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2017	₩ 25,265	₩ 6,577,829	₩ (56,592)	₩ (10,492,539)	₩ (3,946,037)
Balance, shares at Dec. 31, 2017	22,061,317
Private placement	₩ 933	558,997			559,930
Private placement, shares	866,675
Foreign exchange translation gain			1,783		1,783
Remeasurement of pension liabilities			10,389		10,388
Net loss				(10,551)	(10,550)
Balance at Mar. 31, 2018	₩ 26,198	7,136,826	(44,421)	(10,503,089)	(3,384,486)
Balance, shares at Mar. 31, 2018	22,927,992
Balance at Dec. 31, 2018	₩ 26,198	7,221,875	(215,614)	(11,631,198)	(4,598,739)
Balance, shares at Dec. 31, 2018	22,927,992
Foreign exchange translation gain		8,097	(7,855)		242
Remeasurement of pension liabilities			4,309		4,309
Net loss				108,409	108,409
Balance at Mar. 31, 2019	₩ 26,198	₩ 7,229,972	₩ (219,160)	₩ (11,522,789)	₩ (4,485,779)
Balance, shares at Mar. 31, 2019	22,927,992