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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 | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Stockholders Equity Note [Line Items] |  |  |
Common stock, shares outstanding | 40,259,917 | 37,381,954 | 39,941,327
Restricted stock units | 359,977 | 210,100 |
Total | 42,393,356 | 41,709,312 |
New Creditor Warrants (Strike Price $0.001 Per Common Share) |  |  |
Stockholders Equity Note [Line Items] |  |  |
Creditor warrants | 821,308 | 2,070,243 |
GulfMark Creditor Warrants (Strike Price $0.01 Per Common Share) |  |  |
Stockholders Equity Note [Line Items] |  |  |
Creditor warrants | 952,154 | 2,047,015 |

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