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Subsequent Events (Details)			1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
	Aug. 01, 2019 USD ($) $ / shares	Jul. 16, 2019 USD ($) $ / shares	Jul. 16, 2019 USD ($) $ / shares shares	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Aug. 01, 2019 KRW (₩)
Subsequent Event [Line Items]
Proceeds from issuance of common stock, net of issuance costs					$ 2,296,316	$ 1,973,401
Subsequent Events
Subsequent Event [Line Items]
Percentage decrease in workforce		28.00%	28.00%
Restructuring charges		$ 2,300,000
Common stock | Sales Agreement
Subsequent Event [Line Items]
Proceeds from issuance of common stock, net of issuance costs				$ 1,400,000	$ 2,300,000		$ 29,200,000
Common stock | Sales Agreement | Subsequent Events
Subsequent Event [Line Items]
Number of common shares sold (shares) | shares			382,800
Proceeds from issuance of common stock, net of issuance costs			$ 1,100,000
Common shares sold (dollars per share) | $ / shares		$ 3.01	$ 3.01
Korean Won Convertible Promissory Notes | Convertible Debt | Subsequent Events
Subsequent Event [Line Items]
Principal amount	$ 15,000,000							₩ 18,000,000,000
Debt instrument, interest rate, stated percentage	1.00%							1.00%
Debt instrument, convertible, internal rate of return	6.00%							6.00%
Initial Conversion Price | Korean Won Convertible Promissory Notes | Convertible Debt | Subsequent Events
Subsequent Event [Line Items]
Debt instrument, convertible conversion price (in dollars per share) | $ / shares	$ 4.00
Debt instrument, convertible, conversion ratio	0.0002110595
Maximum | After January 2, 2020 Conversion Price | Korean Won Convertible Promissory Notes | Convertible Debt | Subsequent Events
Subsequent Event [Line Items]
Debt instrument, convertible conversion price (in dollars per share) | $ / shares	$ 2.40
Debt instrument, convertible, conversion ratio	0.0003517658

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