Related Party Transactions - 2019 Bridge Notes (Details) - 2019 Bridge Notes	3 Months Ended
	Jun. 26, 2019 USD ($) item $ / shares shares	Jul. 31, 2019 USD ($) $ / shares shares
Related Party Transaction [Line Items]
Number of members of Board of Directors | item	3
Lisa Conte
Related Party Transaction [Line Items]
Principal amount | $	$ 100,000
Number of warrants converted for each share | shares	37,500
James Bochnowski
Related Party Transaction [Line Items]
Principal amount | $	$ 350,000
Number of warrants converted for each share | shares	218,750
Exercise price (in dollars per share) | $ / shares	$ 0.49
Jonathan Siegel DBA JBS Healthcare Ventures
Related Party Transaction [Line Items]
Principal amount | $	$ 75,000
Number of warrants converted for each share | shares	34,375
Exercise price (in dollars per share) | $ / shares	$ 0.49
Sagard Capital Partners
Related Party Transaction [Line Items]
Principal amount | $		$ 500,000
Number of warrants converted for each share | shares		187,500
Exercise price (in dollars per share) | $ / shares		$ 0.49
Jonathan Glaser
Related Party Transaction [Line Items]
Principal amount | $		$ 500,000
Number of warrants converted for each share | shares		250,000
Exercise price (in dollars per share) | $ / shares		$ 0.49