Equity Offerings (Details)						12 Months Ended
	Jan. 20, 2017 USD ($)	Dec. 13, 2016 USD ($) $ / shares shares	Aug. 10, 2016 USD ($) shares	Jul. 10, 2016 USD ($) $ / shares	Jun. 30, 2016	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) vessel $ / shares shares	Dec. 31, 2016 USD ($) vessel shares	Aug. 05, 2016 $ / shares
Class of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares						$ 0.01	$ 0.01		$ 0.01
Proceeds from common stock placement, net of issuance costs						$ 0	$ 96,030,003	$ 85,700,535
Issuance of shares in connection with Second Lien Loan Agreement								17,756,325
Second Lien Lenders | Second Lien Facility
Class of Stock [Line Items]
Aggregate principal amount								$ 60,000,000
Common Stock
Class of Stock [Line Items]
Shares issued for private placement (in shares) | shares							22,222,223	29,333,318
Issuance of shares in connection with the entry into the Second Lien Loan Agreement (in shares) | shares								16,889,828
Issuance of shares in connection with Second Lien Loan Agreement								$ 168,899
Ultramax Vessels
Class of Stock [Line Items]
Number of vessels acquired | vessel							11	11
December Private Placement
Class of Stock [Line Items]
Shares issued for private placement (in shares) | shares		22,200,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.01
Initial price per share of common stock issued (in dollars per share) | $ / shares		$ 4.50
Gross proceeds from issuance of common stock		$ 100,000,000
Proceeds from common stock placement, net of issuance costs	$ 96,000,000
Common Stock Purchase Agreements
Class of Stock [Line Items]
Shares issued for private placement (in shares) | shares			29,333,318
Initial price per share of common stock issued (in dollars per share) | $ / shares				$ 3.00
Gross proceeds from issuance of common stock				$ 88,000,000
Proceeds from common stock placement, net of issuance costs			$ 85,700,000
Ownership percentage before transaction					70.00%