Debt - Summary of Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt, gross	$ 338,600,000
Less: current portion	(29,176,230)	$ (4,000,000)
Total long-term debt	301,583,347	313,683,676
Norwegian Bond Debt
Debt Instrument [Line Items]
Long-term debt, gross	196,000,000
Total long-term debt	182,469,155	189,950,329
New First Lien Facility
Debt Instrument [Line Items]
Long-term debt, gross	60,000,000
Total long-term debt	48,189,307	63,758,185
Repayments of lines of credit	5,000,000	0	$ 0
Ultraco Debt Facility
Debt Instrument [Line Items]
Long-term debt, gross	82,600,000
Total long-term debt	70,924,885	59,975,162
Bond Debt | Norwegian Bond Debt
Debt Instrument [Line Items]
Long-term debt, gross	196,000,000	200,000,000
Debt issuance costs	(5,530,845)	(6,049,671)
Less: current portion	(8,000,000)	(4,000,000)
Long-term debt, net	182,469,155	189,950,329
Line of Credit | New First Lien Facility
Debt Instrument [Line Items]
Long-term debt, gross	60,000,000	65,000,000
Debt issuance costs	(1,060,693)	(1,241,815)
Less: current portion	(10,750,000)	0
Long-term debt, net	48,189,307	63,758,185
Term Loan | Ultraco Debt Facility
Debt Instrument [Line Items]
Long-term debt, gross	82,600,000	61,200,000
Debt issuance costs	(1,248,885)	(1,224,838)
Less: current portion	(10,426,230)	0
Long-term debt, net	70,924,885	$ 59,975,162
Revolving Credit Facility | Line of Credit | New First Lien Facility
Debt Instrument [Line Items]
Repayments of lines of credit	$ 5,000,000