Summary of Significant Accounting Policies (Summary of Geographic Information Relating to Sources, by Nation, of Partnership's Total Revenue and Long-Lived Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 2,534	$ 1,375	$ 3,809	$ 2,871
Percentage of total revenue			100.00%	100.00%
Long-lived assets	6,334		6,334		6,959
Percentage of long lived assets	100.00%		100.00%		100.00%
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues			3,746	2,777
Percentage of total revenue			98.00%	97.00%
Long-lived assets	6,310		6,310		6,935
Percentage of long lived assets	100.00%		100.00%		100.00%
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues			63	94
Percentage of total revenue			2.00%	3.00%
Long-lived assets	24		24		24
Percentage of long lived assets	0.00%		0.00%		0.00%
Total International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues			63	94
Percentage of total revenue			2.00%	3.00%
Long-lived assets	$ 24		$ 24		$ 24
Percentage of long lived assets	0.00%		0.00%		0.00%