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Subsequent Events (Details Textual) - USD ($) | Mar. 17, 2018 | Jan. 03, 2018 | Nov. 28, 2017
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Subsequent Event [Line Items] |  |  |
Research And Development Expense, Sponsored Research Payment |  |  | $ 800,000
Subsequent Event [Member] | City Of Hope [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Research And Development Expense, Sponsored Research Payment |  | $ 900,000 |
Subsequent Event [Member] | City Of Hope [Member] | Patent and Know-how Rights [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Research And Development Expense, Sponsored Research Payment |  | $ 75,000 |
Subsequent Event [Member] | Fred Hutchinson Cancer Research Center [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Research And Development Expense, Sponsored Research Payment | $ 600,000 |  |

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- Definition The amount of research and development expense payable on achieving milestone targets. + References No definition available. + Details
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Namespace Prefix: | ck0001680048_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=ck0001680048_CityOfHopeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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