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Quarterly Financial Data (Detail) (USD $)
 3 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
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Information [Line Items]                      
Product revenue $ 21,459,124 $ 14,055,440 $ 18,882,277 $ 13,613,328 $ 17,725,546 $ 17,756,000 $ 15,414,681 $ 11,060,159 $ 68,010,169 $ 61,956,386 $ 52,735,730
Total revenue 22,606,465 14,766,611 19,624,769 14,360,660 18,444,287 18,455,817 16,140,852 11,737,679 71,358,505 64,778,635 55,556,594
Cost of product revenue 7,269,886 7,221,028 8,084,226 6,413,481 7,128,450 7,394,922 6,655,804 5,604,562 28,988,621 26,783,738 23,826,604
Gross profit on product revenue 14,189,238 6,834,412 10,798,051 7,199,847 10,597,096 10,361,078 8,758,877 5,455,597      
Net income $ 4,463,223 $ 1,645,250 $ 3,736,868 $ 1,912,119 $ 2,883,110 $ 2,976,518 $ 2,282,641 $ 324,412 $ 11,757,460 $ 8,466,680 $ 4,315,995
Per common share information:                      
Basic net income per share $ 0.33 $ 0.12 $ 0.28 $ 0.15 $ 0.22 $ 0.23 $ 0.18 $ 0.03 $ 0.89 $ 0.65 $ 0.34
Basic common shares outstanding 13,324,942 13,287,463 13,262,023 13,162,824 13,122,004 12,817,910 12,725,216 12,688,819 13,260,739 13,064,051 12,624,495
Diluted net income per share $ 0.31 $ 0.11 $ 0.26 $ 0.14 $ 0.21 $ 0.22 $ 0.17 $ 0.02 $ 0.82 $ 0.62 $ 0.32
Diluted common shares outstanding 14,299,211 14,459,154 14,443,794 14,089,946 13,804,806 13,765,533 13,739,836 13,744,710 14,344,577 13,747,813 13,646,533