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Product Revenue by Geographic Location and Percentage of Total Product Revenue (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]        
Product revenue $ 18,882,277 $ 15,414,681 $ 32,495,605 $ 26,474,840
Percentage of revenue 100.00% 100.00% 100.00% 100.00%
UNITED STATES
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Product revenue 16,011,667 11,594,988 26,401,712 19,938,102
Percentage of revenue 85.00% 75.00% 81.00% 75.00%
Europe
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Product revenue 1,521,552 2,604,021 3,677,281 4,637,219
Percentage of revenue 8.00% 17.00% 11.00% 18.00%
Other
        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Product revenue $ 1,349,058 $ 1,215,672 $ 2,416,612 $ 1,899,519
Percentage of revenue 7.00% 8.00% 8.00% 7.00%