Notes Payable - Summary of Components of Total Debt (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Debt [Line Items]
Total debt	$ 79,341,846	$ 48,245,673
ASD Credit Agreement [Member]
Debt [Line Items]
Total debt	50,000,000	50,000,000
Original Issuance Discount - ASD [Member]
Debt [Line Items]
Total debt	(1,500,000)	(2,294,118)
Contingent Interest [Member]
Debt [Line Items]
Total debt	2,015,000	500,000
A&R Credit Agreement [Member]
Debt [Line Items]
Total debt	25,000,000
Termination Fee - A&R [Member]
Debt [Line Items]
Total debt	6,784,626
Termination Fee Debt Discount - A&R [Member]
Debt [Line Items]
Total debt	(4,795,708)
PIK Interest fee [Member]
Debt [Line Items]
Total debt	375,000
PIK Interest - A&R [Member]
Debt [Line Items]
Total debt	1,439,349
Other loans - vehicles [Member]
Debt [Line Items]
Total debt	$ 23,579	$ 39,791