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Quarterly Financial Results (Unaudited) (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Information Disclosure [Abstract]                        
Product sales $ 28,024,000 $ 24,529,000 $ 21,041,000 $ 17,083,000 $ 23,933,000 $ 17,987,000 $ 24,331,000 $ 18,884,000   $ 90,677,292 $ 85,135,618 $ 92,058,745
Service sales 11,519,000 14,293,000 10,978,000 9,645,000 8,000,000 7,634,000 6,241,000 5,525,000   46,434,918 27,400,246 20,184,049
Gross profit 17,090,000 15,490,000 12,451,000 9,943,000 13,481,000 10,412,000 11,995,000 9,078,000        
Net (loss) income $ 2,757,000 $ 1,745,000 $ 453,000 $ (1,375,000) $ 1,604,000 $ 600,000 $ 190,000 $ (1,534,000) $ 3,580,615 $ 3,580,615 $ 859,649 $ 8,273,212
Net (loss) income per share:                        
Basic (in dollars per share) $ 0.19 [1] $ 0.12 [1] $ 0.03 [1] $ (0.09) [1] $ 0.11 [1] $ 0.04 [1] $ 0.01 [1] $ (0.10) [1]   $ 0.24 $ 0.06 $ 0.57
Diluted (in dollars per share) $ 0.18 [1] $ 0.12 [1] $ 0.03 [1] $ (0.09) [1] $ 0.11 [1] $ 0.04 [1] $ 0.01 [1] $ (0.10) [1]   $ 0.24 $ 0.06 $ 0.56
[1] Net (loss) income per share is computed independently for each of the quarters. Therefore, the net (loss) income per share for the four quarters may not equal the annual net income (loss) per share data.