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ACCRUED EXPENSES AND OTHER LIABILITIES - Accrued Expenses and Other Liabilities (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Payables And Accruals [Abstract]
Cost incurred in connection with the preparation for the Company's IPO included in accrued professional fees	$ 0.4

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- Definition

Represents the carrying value, as of the balance sheet date, of obligations incurred through that date and payable for public offering costs. It is used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle, if longer).

+ References

No definition available.

+ Details

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Namespace Prefix:	nerv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	us-gaap_PayablesAndAccrualsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration