4. STOCKHOLDERS' EQUITY (Tables)

9 Months Ended

Sep. 30, 2013

Equity [Abstract]

Compensation expense associated with stock options

	Nine Months Ended
	September 30, 2013
Expected term	6.25 years
Volatility	63%
Dividend yield	0.0
Risk-free interest rate	1.24%

Companys option and warrant activity

	Nine Months Ended
	September 30, 2013
			Weighted
			Average
			Exercise
	Shares		Price
Outstanding at beginning of period		749,211	$	6.86
Granted		25,587	$	7.56
Outstanding at end of period and expected to vest		774,798	$	6.89
Options exercisable		349,564	$	6.08
Weighted average fair value of options granted during period			$	4.42

Stock-based compensation expenses

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2013		2012		2013		2012
Research and development	$	55,067	$	43,178	$	162,643	$	49,446
General and administrative		170,154		165,017		503,893		359,098
Total stock-based compensation expense	$	225,221	$	208,195	$	666,536	$	408,544