Selected Quarterly Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Summary of Quarterly Financial Information

The following is a summary of quarterly financial information for the years ended December, 31, 2013 and 2012, respectively:

	Three months ended
	March 31, 2013			June 30, 2013			September 30, 2013			December 31, 2013
Total revenues	$	19,407,941		$	19,931,208		$	21,292,574		$	22,503,218
Total operating expenses	$	16,557,885		$	16,667,044		$	17,229,995		$	19,315,207
Operating income	$	2,850,056		$	3,264,164		$	4,062,579		$	3,188,011
Net loss	$	(2,167,459	)	$	(1,949,099	)	$	(689,288	)	$	(2,639,352	)
Net loss attributable to the Company	$	(2,167,224	)	$	(1,949,079	)	$	(693,245	)	$	(2,637,508	)
Net loss per share-basic and diluted	$	(0.05	)	$	(0.04	)	$	(0.01	)	$	(0.05	)
	Three months ended
	March 31, 2012			June 30, 2012			September 30, 2012			December 31, 2012
Total revenues	$	15,351,917		$	15,705,274		$	17,098,173		$	18,455,140
Total operating expenses	$	15,455,345		$	16,136,742		$	17,000,260		$	17,351,457
Operating income (loss)	$	(103,428	)	$	(431,468	)	$	97,913		$	1,103,683
Net loss	$	(5,451,145	)	$	(5,091,133	)	$	(4,620,823	)	$	(3,852,041	)
Net loss attributable to the Company	$	(5,432,094	)	$	(5,087,074	)	$	(4,610,650	)	$	(3,843,894	)
Net loss per share-basic and diluted	$	(0.15	)	$	(0.12	)	$	(0.11	)	$	(0.08	)