10. Income Taxes (Detail) - (Table 1) Table of Differences between Income Taxes using the Statutory U.S. Federal Income Tax Rate (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Pre-tax net loss	$ (9,820,625)	$ (9,053,764)
Amount computed using the Statutory U.S. federal rate	(3,339,012)	(3,078,280)
Increase (reduction) in taxes resulting from valuation allowance	3,186,987	1,788,545
Loss on extinguishment of debt		934,842
Fair value adjustment of warrants	(202,283)	(863,361)
Interest on debt treated as equity	13,284	614,065
Stock-based compensation—ISO	131,221	180,025
Stock offering costs		316,478
Other	209,803	107,686
Provision (benefit) for income taxes	$ 0	$ 0