Property and Equipment (Detail) - Property and Equipment (USD $)
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Jun. 30, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Property and equipment, gross | $ 2,240,908 | $ 2,023,000 | $ 1,446,794 |
Less accumulated depreciation and amortization | (1,003,731) | (804,170) | (467,285) |
Total property and equipment, net | 1,237,177 | 1,218,830 | 979,509 |
Equipment [Member]
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Property and equipment, gross | 1,010,608 | 934,253 | 906,485 |
Furniture and Fixtures [Member]
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Property and equipment, gross | 105,376 | 106,054 | 106,053 |
Leasehold Improvements [Member]
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Property and equipment, gross | 157,236 | 157,236 | 157,236 |
Computer Equipment [Member]
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Property and equipment, gross | 106,557 | 101,482 | 103,150 |
Loaned Systems [Member]
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Property and equipment, gross | $ 861,131 | $ 723,975 | $ 173,870 |
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