Debt Obligations for Continuing Operations (Parenthetical) (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Line of Credit	Dec. 31, 2011 Line of Credit	Mar. 31, 2013 Capital Lease Obligations	Dec. 31, 2011 Capital Lease Obligations	Mar. 31, 2013 June July 2012 Bridge Note	Dec. 31, 2011 June July 2012 Bridge Note	Mar. 31, 2013 January 2013 Bridge Notes	Jan. 24, 2013 January 2013 Bridge Notes	Dec. 31, 2011 January 2013 Bridge Notes
Debt Instrument [Line Items]
Debt obligations, current and non-current, principal			$ 3,000,000	$ 3,000,000			$ 7,100,000	$ 7,100,000	$ 1,650,000		$ 0
Capital Lease Obligation, Principal Amount	2,984,095	3,146,110
Debt obligations, current and non-current, accrued interest			9,188	9,188	29,730	31,344	209,938	214,751			0
Debt obligations, current and non-current, debt discount							$ 1,079,927	$ 1,504,353	$ 708,003	$ 300,000	$ 0