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Property and Equipment (Detail) - Property and Equipment (USD $)
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Sep. 30, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Property and Equipment | $ 2,378,637 | $ 2,023,000 | $ 1,446,794 |
| Less accumulated depreciation and amortization | (1,096,907) | (804,170) | (467,285) |
| Total property and equipment, net | 1,281,730 | 1,218,830 | 979,509 |
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Equipment [Member]
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| Property and Equipment | 1,017,634 | 934,253 | 906,485 |
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Furniture and Fixtures [Member]
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| Property and Equipment | 105,376 | 106,054 | 106,053 |
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Leasehold Improvements [Member]
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| Property and Equipment | 157,236 | 157,236 | 157,236 |
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Computer Equipment [Member]
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| Property and Equipment | 108,285 | 101,482 | 103,150 |
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Loaned Systems [Member]
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| Property and Equipment | $ 990,106 | $ 723,975 | $ 173,870 |
| X | ||||||||||
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- Definition
The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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