Significant Accounting Policies (Details)	3 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) t	Dec. 31, 2016 USD ($) vessel	Dec. 31, 2015 USD ($) vessel	Mar. 31, 2017 vessel
Property, Plant and Equipment [Line Items]
Restricted cash			$ 74,917	$ 74,917
Certificates of deposit			$ 4,500,000
Average scrap value			15 years
Asset impairment charges			$ 0	129,000,000	$ 50,900,000
Amortization period for vessels over fifteen years old			30 months
Age of vessels			15 years
Amortization period for vessels less than fifteen years old			60 months
Deferred financing costs - Super Senior Revolver Facility			$ 190,000	$ 0
Vessels in operation | vessel				1	13	1
Tax expense		$ (600,000)		$ 600,000	$ 300,000
Accumulated deficit related to ASU 2014-09			427,164,813	383,368,128
Decrease in financing cash flows used			127,595,602	106,334,650	18,455,772
Increase in operating cash flows used			$ (7,388,971)	$ 45,434,310	$ 43,786,769
Minimum
Property, Plant and Equipment [Line Items]
Vessel useful lives			3 years
Maximum
Property, Plant and Equipment [Line Items]
Vessel useful lives			10 years
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Minimum | Pro Forma
Property, Plant and Equipment [Line Items]
Accumulated deficit related to ASU 2014-09			$ 500,000
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Maximum | Pro Forma
Property, Plant and Equipment [Line Items]
Accumulated deficit related to ASU 2014-09			1,300,000
Accounting Standards Update 2016-15 | Scenario, Forecast
Property, Plant and Equipment [Line Items]
Decrease in financing cash flows used	$ 17,700,000
Increase in operating cash flows used	$ 17,700,000
Accounting Standards Update 2016-18 | Pro Forma
Property, Plant and Equipment [Line Items]
Prior period reclassified costs			74,917
Super Senior Revolver Facility | Revolving Credit Facility
Property, Plant and Equipment [Line Items]
Proceeds from lines of credit			$ 0
Vessels
Property, Plant and Equipment [Line Items]
Vessel useful lives			25 years
Scrap value of vessels | t			300