Supplemental Cash Flow Disclosures - Non-Cash Transactions (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Preferred dividends paid by issuance of stock	$ 82,500	$ 333,556
Accrued dividends on preferred stock	0	346,236
Reclassification of derivative liabilities for modified warrant agreements		1,434,322
Discharge of previously deferred financing costs for modified warrant agreements		136,543
Derivative liability for embedded conversion option	0	2,085,513
Conversion of convertible debt to common stock	924,904	600,000
Business combination:
Issuance of contingent consideration	11,109,020	0
Issuance of replacement warrants	1,883,751	0
Common stock issued in satisfaction of subscription receivable	2,790,107	0
Effect of cancellation of escrowed shares	195,132	0
Obligation to issue shares for professional services	30,000	0
Series E Preferred Stock [Member]
Business combination:
Series E Preferred Stock	$ 18,955,742	$ 0