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Accrued License Payments - Related Party - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Accrued license payments - related party	$ 100,000us-gaap_DueToRelatedPartiesCurrent	$ 100,000us-gaap_DueToRelatedPartiesCurrent

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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