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Significant Accounting Policies - Additional Information (Detail) (USD $)
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3 Months Ended | ||
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Mar. 31, 2014
Supplier
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Mar. 31, 2013
Supplier
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Dec. 31, 2013
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| Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] | |||
| Number of dental distributor with guaranteed rights of returns | 2 | ||
| Inventory reserve | $ 34,700 | $ 31,500 | |
| Accounts payable and accrued expenses for key suppliers | 807,376 | 909,957 | |
| Uninsured portion of cash balance | 14,388,954 | 16,026,510 | |
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Supplier Concentration Risk [Member]
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| Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] | |||
| Number of key suppliers | 4 | 4 | |
| Accounts payable and accrued expenses for key suppliers | 0 | 146,284 | |
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Guaranteed Rights of Return [Member]
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| Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] | |||
| Revenue deferred under guaranteed rights of return arrangements | $ 50,400 | $ 18,839 | |