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Deferred Revenues (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Deferred Revenue [Abstract] |  |
Non-refundable, upfront payment | $ 2,500,000 |
Receive non-refundable milestone payments | 16,000,000 |
Estimated total transaction price | 2,500,000 |
Deferred revenue | 2,500,000 |
Long-term deferred revenues | $ 2,500,000 | $ 2,500,000

X
- Definition The amount of estimated total transaction price. + References No definition available. + Details
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Namespace Prefix: | nlsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of non-refundable upfront payment. + References No definition available. + Details
Name: | nlsp_NonrefundableUpfrontPayments
Namespace Prefix: | nlsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of receive non-refundable milestone payments. + References No definition available. + Details
Name: | nlsp_ReceiveNonrefundableMilestonePayment
Namespace Prefix: | nlsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_DeferredRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DeferredRevenueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References No definition available. + Details
Name: | us-gaap_DeferredRevenueRevenueRecognized1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration