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Goodwill and Indefinite-Lived Intangible Assets - Additional Information (Detail) (USD $)
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3 Months Ended | |||
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Mar. 31, 2014
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Mar. 31, 2013
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Dec. 31, 2013
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Oct. 01, 2013
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| Schedule Of Goodwill And Intangible Assets [Line Items] | ||||
| Carrying value of indefinite-lived intangible asset | $ 10,409,855 | $ 10,318,001 | ||
| Impairment of indefinite-lived intangible asset | 0 | 0 | ||
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OncoHist [Member]
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| Schedule Of Goodwill And Intangible Assets [Line Items] | ||||
| Fair value of indefinite-lived intangible asset | 10,559,820 | |||
| Carrying value of indefinite-lived intangible asset | 10,409,855 | 10,318,001 | ||
| Impairment of indefinite-lived intangible asset | $ 0 | $ 0 | ||