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Goodwill and Indefinite-Lived Intangible Assets - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | ||||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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Oct. 01, 2013
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| Indefinite-lived Intangible Assets [Line Items] | ||||||
| Carrying value of indefinite-lived intangible asset | $ 10,702,400 | $ 10,702,400 | $ 10,318,001 | |||
| Impairment of indefinite-lived intangible asset | 0 | 0 | ||||
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OncoHist [Member]
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| Indefinite-lived Intangible Assets [Line Items] | ||||||
| Fair value of indefinite-lived intangible asset | 10,559,820 | |||||
| Carrying value of indefinite-lived intangible asset | 10,702,400 | 10,702,400 | 10,318,001 | |||
| Impairment of indefinite-lived intangible asset | $ 0 | $ 0 | $ 0 | $ 0 | ||