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Leases - Additional Information (Detail) (USD $)
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12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2013
Y
|
Dec. 31, 2012
|
Dec. 31, 2011
|
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| Leases Disclosure [Line Items] | |||
| Facilities leased under non-cancellable operating leases term range, minimum | 5 | ||
| Facilities leased under non-cancellable operating leases term range, maximum | 15 | ||
| Facilities leased under non-cancellable operating leases renewal option range, minimum | 5 | ||
| Facilities leased under non-cancellable operating leases renewal option range, maximum | 10 | ||
| Rent expense under all operating leases | $ 424,096 | $ 345,066 | $ 295,099 |
| Net book value of property and equipment under capital leases | $ 145,615 | $ 92,667 | |