Liquidity and Management's Plans - Additional Information (Details) - USD ($)								1 Months Ended	3 Months Ended	6 Months Ended		22 Months Ended
	Jul. 14, 2018	Jun. 11, 2018	Apr. 19, 2018	Feb. 06, 2018	Jul. 18, 2017	May 31, 2017	Sep. 13, 2016	Jul. 31, 2017	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018
Conversion Of Stock [Line Items]
Net proceeds from sale of common stock and warrants										$ 10,728,132	$ 0
Net proceeds from sale of common stock										192,322	$ 3,426,050
Bridge Financing Notes [Member] | Note Purchase Agreement [Member]
Conversion Of Stock [Line Items]
Interest rate						10.00%
Maturity date						Sep. 30, 2017
Bridge Financing Notes [Member] | Note Purchase Agreement [Member] | Maximum [Member]
Conversion Of Stock [Line Items]
Aggregate principal amount						$ 1,500,000
Bridge Financing Note One [Member] | Note Purchase Agreement [Member]
Conversion Of Stock [Line Items]
Aggregate principal amount						500,000
Bridge Financing Note Two [Member] | Note Purchase Agreement [Member]
Conversion Of Stock [Line Items]
Aggregate principal amount						500,000
Bridge Financing Note Three [Member] | Note Purchase Agreement [Member]
Conversion Of Stock [Line Items]
Aggregate principal amount						$ 500,000
Qualified Financing [Member] | Note Purchase Agreement [Member] | Minimum [Member]
Conversion Of Stock [Line Items]
Net proceeds from equity or debt financing										$ 5,000,000
Merck GHI Financing Agreement [Member] | The Allonge [Member]
Conversion Of Stock [Line Items]
Aggregate principal amount		$ 1,000,000
Revised and extended maturity date for payment, terms		Six semi-annual payments
Principal payments includes accrued and unpaid interest		$ 166,667
Beginning date of debt maturity		Jan. 02, 2019
Ending date of debt maturity		Jul. 01, 2021
Merck GHI Financing Agreement [Member] | The Allonge [Member] | Subsequent Event [Member]
Conversion Of Stock [Line Items]
Accrued and unpaid interest	$ 285,512
Stock Purchase Warrants [Member] | Bridge Financing Notes [Member] | Note Purchase Agreement [Member]
Conversion Of Stock [Line Items]
Class of warrant or right, exercise price of warrants or rights											$ 19.50
Class of warrant or right, number of securities called by warrants or rights											5,634
Warrants [Member] | Bridge Financing Notes [Member] | Note Purchase Agreement [Member]
Conversion Of Stock [Line Items]
Class of warrant or right, exercise price of warrants or rights								$ 17.25
Class of warrant or right, number of securities called by warrants or rights								6,350
February 2018 Public Offering [Member]
Conversion Of Stock [Line Items]
Stock issued during period, shares, new issues				2,841,152
Shares issued, price per share				$ 3.25
Gross proceeds from sale of common stock and warrants				$ 12,000,000
Net proceeds from sale of common stock and warrants				$ 10,700,000
Sale of stock, description of transaction										Each unit included one share of common stock and one common warrant to purchase 0.5 share of common stock at an exercise price of $3.25 per share. Each pre-funded unit included one pre-funded warrant to purchase one share of common stock for an exercise price of $0.01 per share, and one common warrant to purchase 0.5 share of common stock at an exercise price of $3.25 per share.
Class of warrant or right, number of securities called by each warrant or right				0.5
Class of warrant or right, exercise price of warrants or rights				$ 3.25
Warrants exercisable period				5 years
February 2018 Public Offering [Member] | Pre-funded Units [Member]
Conversion Of Stock [Line Items]
Stock issued during period, shares, new issues				851,155
Shares issued, price per share				$ 3.24
February 2018 Public Offering [Member] | Pre-funded Warrants [Member]
Conversion Of Stock [Line Items]
Class of warrant or right, exercise price of warrants or rights				$ 0.01
Warrants exercised			851,155						673,077	851,155
July 2017 Public Offering [Member]
Conversion Of Stock [Line Items]
Stock issued during period, shares, new issues					18,164,195
Shares issued, price per share					$ 0.40
Gross proceeds from sale of common stock and warrants					$ 10,000,000
Net proceeds from sale of common stock and warrants					$ 8,800,000
Sale of stock, description of transaction										Each unit included one twenty-fifth of a share of common stock and one common warrant to purchase one twenty-fifth of a share of common stock at an exercise price of $10.63 per share. Each pre-funded unit included one pre-funded warrant to purchase one twenty-fifth of a share of common stock for an exercise price of $0.25 per share, and one common warrant to purchase one twenty-fifth of a share of common stock at an exercise price of $10.63 per share.
Class of warrant or right, number of securities called by each warrant or right					0.04
Class of warrant or right, exercise price of warrants or rights					$ 10.63
Warrants exercisable period					5 years
July 2017 Public Offering [Member] | Bridge Financing Notes [Member]
Conversion Of Stock [Line Items]
Repayment of outstanding debt					$ 1,000,000			$ 1,000,000
July 2017 Public Offering [Member] | Pre-funded Units [Member]
Conversion Of Stock [Line Items]
Stock issued during period, shares, new issues					6,835,805
Shares issued, price per share					$ 0.39
July 2017 Public Offering [Member] | Pre-funded Warrants [Member]
Conversion Of Stock [Line Items]
Class of warrant or right, number of securities called by each warrant or right					0.04
Class of warrant or right, exercise price of warrants or rights					$ 0.25
At the Market Offering [Member] | Sales Agreement [Member] | Cowen and Company, LLC [Member]
Conversion Of Stock [Line Items]
Aggregate gross proceeds from issuance of common stock										$ 9,000,000
Stock issued during period, value, new issues							$ 11,500,000
Aggregate net proceeds from sale of common stock										8,400,000
Remaining availability under at the market offering										2,500,000
Net proceeds from sale of common stock									$ 200,000	200,000
Gross proceeds from sale of common stock									$ 200,000	$ 200,000
At the Market Offering [Member] | Sales Agreement [Member] | Maximum [Member] | Cowen and Company, LLC [Member]
Conversion Of Stock [Line Items]
Aggregate gross proceeds from issuance of common stock							$ 25,000,000
At the Market Offering [Member] | Common Stock [Member] | Sales Agreement [Member] | Cowen and Company, LLC [Member]
Conversion Of Stock [Line Items]
Stock issued during period, shares, new issues									104,043	104,043		476,054
Net proceeds from sale of common stock									$ 200,000	$ 200,000
Gross proceeds from sale of common stock									$ 200,000	$ 200,000