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Significant Accounting Policies - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | |||
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Jun. 30, 2013
Supplier
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Jun. 30, 2012
Supplier
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Jun. 30, 2013
Supplier
Customer
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Jun. 30, 2012
Supplier
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Dec. 31, 2012
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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 FIFO | $ 13,000 | $ 13,000 | $ 253,000 | ||
| Number of key suppliers | 4 | 4 | 4 | 4 | |
| Accounts payable and accrued expenses for key suppliers | 1,222,463 | 1,222,463 | 1,157,520 | ||
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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 | 23,147 | 23,147 | 27,812 | ||
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Supplier Concentration Risk [Member]
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| Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] | |||||
| Accounts payable and accrued expenses for key suppliers | $ 66,000 | $ 66,000 | $ 99,000 | ||