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Net Income (Loss) Per Share Applicable to Common Stockholders - Net income (loss) per share applicable to common stockholders (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Numerator:      
Net income (loss) $ 74,802 $ (871,774) $ (3,298,082)
Basic 4,861,063 4,838,214  
Diluted 4,871,992 4,838,214  
Net income (loss) per share:      
Basic $ 0.02 $ (0.18)  
Diluted $ 0.02 $ (0.18)