Liquidity and Management's Plans - Additional Information (Details) - USD ($)						1 Months Ended	3 Months Ended		19 Months Ended
	Feb. 06, 2018	Jul. 18, 2017	Jun. 28, 2017	May 31, 2017	Sep. 13, 2016	Jul. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Jun. 30, 2017
Conversion Of Stock [Line Items]
Net proceeds from sale of common stock and warrants							$ 10,721,401	$ 0
Net proceeds from sale of common stock							$ 0	$ 2,122,861
Merck GHI Financing Agreement [Member]
Conversion Of Stock [Line Items]
Interest rate			10.00%
Maturity date							Jul. 14, 2017
Debt instrument, extended maturity date							Jul. 14, 2018
Percentage of warrants to purchase common stock shares on outstanding principal and accrued interest on issuance date			20.00%
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
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
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 $10.625 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 $10.625 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		$ 10.625
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]
Stock issued during period, value, new issues					$ 11,500,000
Net proceeds from sale of common stock							$ 8,200,000
Gross proceeds from sale of common stock							8,800,000
Remaining availability under at the market offering							$ 2,700,000
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							0		372,011