Stockholders' Equity and Dilutive Equity Instruments - Summary of Common Shares and Creditor Warrants and Sum of Common Shares and Creditor Warrants Outstanding (Parenthetical) (Details) - $ / shares	Sep. 30, 2019	Sep. 30, 2018
New Creditor Warrants (Strike Price $0.001 Per Common Share)
Stockholders Equity Note [Line Items]
Strike price per common share	$ 0.001	$ 0.001
GulfMark Creditor Warrants (Strike Price $0.01 Per Common Share)
Stockholders Equity Note [Line Items]
Strike price per common share	$ 0.01	$ 0.01