XML 39 R26.htm IDEA: XBRL DOCUMENT
v3.19.1

SIGNIFICANT ACCOUNTING POLICIES - Amortized Cost Basis, Aggregate Fair Value, Unrealized (Gains)/Losses and Net Carrying Value of Investments in Held-to-maturity Securities (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |
Marketable securities, Amortized Cost | $ 48,556,558 | $ 37,762,439
Marketable securities, Aggregate Fair Value | 48,568,165 | 37,757,896
Marketable securities, Unrealized Gains |  | 4,543
Marketable securities, Unrealized Losses | (11,607) |
Marketable securities, Net Carrying Value | 48,556,558 | 37,762,439
Corporate Bonds/Notes |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Marketable securities, Amortized Cost | 10,823,308 | 16,054,071
Marketable securities, Aggregate Fair Value | 10,832,228 | 16,050,462
Marketable securities, Unrealized Gains |  | 3,609
Marketable securities, Unrealized Losses | (8,920) |
Marketable securities, Net Carrying Value | 10,823,308 | 16,054,071
Commercial Paper |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Marketable securities, Amortized Cost | 25,819,617 | 17,756,394
Marketable securities, Aggregate Fair Value | 25,819,617 | 17,756,394
Marketable securities, Net Carrying Value | 25,819,617 | 17,756,394
U.S. government Agency Securities |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Marketable securities, Amortized Cost | 11,913,633 | 3,951,974
Marketable securities, Aggregate Fair Value | 11,916,320 | 3,951,040
Marketable securities, Unrealized Gains |  | 934
Marketable securities, Unrealized Losses | (2,687) |
Marketable securities, Net Carrying Value | $ 11,913,633 | $ 3,951,974

X
- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity). + References No definition available. + Details
Name: | us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=nerv_CorporateBondsOrNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |