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v3.19.2

Commitments and Contingencies - Additional Information (Details) | 6 Months Ended
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Jun. 30, 2019
Maximum |
Commitments And Contingencies [Line Items] |
Agreement termination notice period | 1 year

X
- Definition Agreement termination notice period. + References No definition available. + Details
Name: | dtil_AgreementTerminationNoticePeriod
Namespace Prefix: | dtil_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent commitments and contingencies. + References No definition available. + Details
Name: | dtil_CommitmentsAndContingenciesLineItems
Namespace Prefix: | dtil_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |