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Quarterly Financial Data (Unaudited) (Summarized Quarterly Financial Information (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information [Line Items]
Total income (loss)	$ (17,575,229)us-gaap_Revenues	$ (6,424,544)us-gaap_Revenues	$ 4,045,515us-gaap_Revenues	$ 1,636,925us-gaap_Revenues	$ (678,456)us-gaap_Revenues	$ 5,892,884us-gaap_Revenues	$ (2,281,454)us-gaap_Revenues	$ 3,488,007us-gaap_Revenues	$ (18,317,333)us-gaap_Revenues	$ 6,420,981us-gaap_Revenues	$ (9,348,400)us-gaap_Revenues
Total expenses	94,542us-gaap_OperatingExpenses	115,775us-gaap_OperatingExpenses	132,839us-gaap_OperatingExpenses	145,584us-gaap_OperatingExpenses	170,197us-gaap_OperatingExpenses	205,028us-gaap_OperatingExpenses	220,417us-gaap_OperatingExpenses	247,095us-gaap_OperatingExpenses	488,740us-gaap_OperatingExpenses	842,737us-gaap_OperatingExpenses	1,050,378us-gaap_OperatingExpenses
Net income (loss)	$ (17,669,771)us-gaap_NetIncomeLoss	$ (6,540,319)us-gaap_NetIncomeLoss	$ 3,912,676us-gaap_NetIncomeLoss	$ 1,491,341us-gaap_NetIncomeLoss	$ (848,653)us-gaap_NetIncomeLoss	$ 5,687,856us-gaap_NetIncomeLoss	$ (2,501,871)us-gaap_NetIncomeLoss	$ 3,240,912us-gaap_NetIncomeLoss	$ (18,806,073)us-gaap_NetIncomeLoss	$ 5,578,244us-gaap_NetIncomeLoss	$ (10,398,778)us-gaap_NetIncomeLoss
Net income (loss) per share	$ (15.21)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (5.37)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 3.07us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 1.27us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (0.36)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 3.12us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (0.96)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 1.22us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (16.24)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 3.02us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (3.65)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax

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