MGHIF financing - Additional Information (Details) - USD ($)					1 Months Ended	6 Months Ended
	Jul. 30, 2018	Jul. 14, 2018	Jun. 11, 2018	Jun. 28, 2017	Jul. 31, 2015	Jun. 30, 2019	Jun. 30, 2018
Common Stock and Note Purchase Agreement [Line Items]
Proceeds from issuance of common stock, net of issuance costs						$ 4,782,509	$ 192,320
MGHIF Financing Agreement [Member]
Common Stock and Note Purchase Agreement [Line Items]
Stock issued during period, shares, new issues					45,454
Shares issued, price per share					$ 110.00
Proceeds from issuance of common stock, net of issuance costs					$ 5,000,000
Debt instrument, interest rate, stated percentage					8.00%
Debt instrument, face amount					$ 1,000,000
Unamortized debt issuance costs			$ 7,000
MGHIF Financing Agreement [Member] | The Allonge [Member]
Common Stock and Note Purchase Agreement [Line Items]
Debt instrument, face amount			$ 1,000,000
Accrued and unpaid interest		$ 285,512
Revised and extended the maturity date, payment terms			Six semi-annual payments
Annual payments plus accrued and unpaid interest			$ 166,667
Beginning date of debt maturity			Jan. 02, 2019
Ending date of debt maturity			Jul. 01, 2021
MGHIF Financing Agreement [Member] | The Allonge [Member] | Common Stock [Member] | Private Placement [Member]
Common Stock and Note Purchase Agreement [Line Items]
Stock issued during period, shares, new issues	144,238
Accrued and unpaid interest	$ 285,512
Stock issued during period, accrued and unpaid interest due	$ 285,512
Accrued and unpaid interest due date	Jul. 14, 2018
Amended and Restated MGHIF Financing Agreement [Member]
Common Stock and Note Purchase Agreement [Line Items]
Debt instrument, interest rate, stated percentage				10.00%
Debt instrument, extended maturity date				Jul. 14, 2018
Issuance of common stock warrants to purchase				13,120