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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
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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

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Details
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