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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 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Numerator:          
Net income (loss) $ 43,509 $ (755,400) $ 118,311 $ (1,627,174) $ (3,298,082)
Basic 4,864,953 4,854,179 4,863,008 4,846,197  
Diluted 4,987,156 4,854,179 4,946,155 4,846,197  
Net income (loss) per share:          
Basic $ 0.01 $ (0.16) $ 0.02 $ (0.34)  
Diluted $ 0.01 $ (0.16) $ 0.02 $ (0.34)