Stockholders' Equity - Warrants Issued and Outstanding (Details) - $ / shares	Dec. 31, 2019	Jun. 30, 2018	Jun. 11, 2018	Nov. 20, 2017	Jan. 11, 2017
Class of Stock [Line Items]
Exercise price of warrants (USD per share)		$ 0.001
Number of warrants (shares)	9,692,879
Private Placement | January 11, 2017 Warrants
Class of Stock [Line Items]
Exercise price of warrants (USD per share)					$ 0.001
Number of warrants (shares)	5,133,230
Private Placement | November 20, 2017 Warrants
Class of Stock [Line Items]
Exercise price of warrants (USD per share)				$ 0.001
Number of warrants (shares)	4,137,999
Private Placement | June 11, 2018 Warrants
Class of Stock [Line Items]
Exercise price of warrants (USD per share)			$ 0.001
Number of warrants (shares)	421,650