Offering Costs and Formation Transaction Expenses - Effect of Correction on Combined Financial Statements (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Organization And Offering Costs [Line Items]
Formation transaction expenses	$ 68,942	$ 24,491	$ 173,756	$ 38,837
Net loss	(620,738)	(240,124)	(1,282,807)	(426,972)	1,967,456
Net cash provided by operating activities			669,459	538,336
Net cash used in financing activities			(1,353,859)	(1,247,478)
Net change in cash and cash equivalents			(684,400)	(692,158)
As Reported [Member]
Organization And Offering Costs [Line Items]
Net loss				(388,135)
Net cash provided by operating activities				577,173
Net cash used in financing activities				(1,286,315)
Net change in cash and cash equivalents				(692,158)
Adjustment [Member]
Organization And Offering Costs [Line Items]
Formation transaction expenses				38,837
Net loss				(38,837)
Net cash provided by operating activities				(38,837)
Net cash used in financing activities				38,837
As Adjusted [Member]
Organization And Offering Costs [Line Items]
Formation transaction expenses				38,837
Net loss				(426,972)
Net cash provided by operating activities				538,336
Net cash used in financing activities				(1,247,478)
Net change in cash and cash equivalents				$ (692,158)