Consolidated Statements of Operations and Comprehensive Loss (Unaudited) ₩ in Thousands	3 Months Ended
	Mar. 31, 2019 $ / shares	Mar. 31, 2019 KRW (₩) shares	Mar. 31, 2018 $ / shares	Mar. 31, 2018 KRW (₩) shares
Revenue
Total revenue		₩ 1,280,331		₩ 1,309,483
Cost of revenue
Total cost of revenue		733,464		855,015
Gross margin		546,867		454,468
Selling, general and administrative expenses		324,334		394,281
Research and development		71,860		29,810
Income from operations		150,673		30,377
Other expense:
Interest expense, net		(39,698)		(39,817)
Other expense, net		(4,186)		(4,040)
Total other expense		(43,884)		(43,857)
Income (Loss) before provision for income taxes		106,789		(13,480)
Income tax benefit		(1,621)		(2,930)
Net income (loss)		₩ 108,409		₩ (10,550)
Basic net income (loss) per share | $ / shares	$ 4.73		$ (0.48)
Diluted net income (loss) per share | $ / shares	$ 3.92		$ (0.48)
Basic weighted average shares outstanding | shares		22,927,992		22,119,095
Diluted weighted average shares outstanding | shares		27,680,416		22,119,095
Net income (loss)		₩ 108,409		₩ (10,550)
Other comprehensive income (loss):
Foreign exchange translation gain (loss)		(7,855)		1,783
Remeasurement of pension liabilities		4,309		10,388
Other comprehensive income (loss), net of tax:		(3,546)		12,171
Comprehensive income		104,864		1,621
Product [Member]
Revenue
Total revenue		558,665		249,001
Cost of revenue
Total cost of revenue		251,520		182,387
Service [Member]
Revenue
Total revenue		721,666		1,060,482
Cost of revenue
Total cost of revenue		₩ 481,944		₩ 672,628