Debt and Warrants - December 2016 Convertible debt (Details)		1 Months Ended
	Mar. 16, 2018 USD ($) shares	Jan. 31, 2019 USD ($) shares	Aug. 31, 2018 USD ($) shares	Jul. 31, 2017 USD ($) Lender	Dec. 31, 2016 USD ($) $ / shares Lender	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)
Convertible promissory notes, December 2016
Debt and Warrants
Notes payable					$ 2,500,000
Number of lenders | Lender					3
Proceeds from issuance of convertible debt					$ 2,000,000
Unamortized note discount					$ 500,000
Conversion price (in dollars per share) | $ / shares					$ 0.925
Revised principal value of debt								$ 2,625,338
Annual percentage of conversion					33.00%
Fair value of notes					$ 11,161,000
Difference between the fair value of the notes and the principal balance					$ 1,035,661
Amortization period of such difference amount					29 months
Interest Payable	$ 534,775		$ 479,808
Debt legal fee	$ 169,950
Repayment of accrued interest		$ 446,729
Shares issued (in shares) | shares	285,694	1,382,636	320,743
Convertible promissory notes, December 2016 | Convertible Long-term Debt
Debt and Warrants
Unamortized balance of notes payable						$ 10,446,751	$ 10,553,888
Convertible note purchase agreement
Debt and Warrants
Notes payable					$ 12,500,000
Interest rate (as a percent)				10.00%
Debt instrument, frequency of periodic payment				six-month
Accrued interest capitalized to principal of debt								$ 125,338
Convertible promissory notes, July 2017
Debt and Warrants
Notes payable				$ 7,500,000
Number of lenders | Lender				4
Proceeds from issuance of convertible debt				$ 6,000,000
Unamortized note discount				$ 1,500,000