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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 (Details) - shares | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Stockholders Equity Note [Line Items] |  |  |
Common stock, shares outstanding | 37,845,158 | 36,978,280 | 26,085,274
Total | 41,562,540 |  | 30,009,715
New Creditor Warrants (Strike Price $0.001 Per Common Share) |  |  |
Stockholders Equity Note [Line Items] |  |  |
Creditor Warrants | 2,034,235 |  | 3,924,441
GulfMark Creditor Warrants (Strike Price $0.01 Per Common Share) |  |  |
Stockholders Equity Note [Line Items] |  |  |
Creditor Warrants | 1,683,147 |  |

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