Quarterly report pursuant to sections 13 or 15(d)

4. STOCKHOLDERS' EQUITY (Details 1)

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4. STOCKHOLDERS' EQUITY (Details 1) (USD $)
3 Months Ended
Mar. 31, 2013
Shares  
Outstanding at beginning of period 749,211
Granted 25,587
Outstanding at end of period and expected to vest 774,798
Options exercisable 263,963
Weighted Average Exercise Price  
Outstanding at beginning of period $ 6.86
Granted $ 7.56
Outstanding at end of period and expected to vest $ 6.88
Options exercisable $ 5.61
Weighted-average fair value of options granted during the period $ 7.56