XML 73 R62.htm IDEA: XBRL DOCUMENT
v3.20.2

Fair Value Measurements - Summary of Placement in the Fair Value Hierarchy of Financial Assets that are Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | $ 86,292 | $ 9,260
Quoted Prices in Active Markets (Level 1) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 86,292 | 9,260
Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 0 | 0
U.S. government debt securities |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 86,028 | 8,996
U.S. government debt securities | Quoted Prices in Active Markets (Level 1) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 0 | 0
U.S. government debt securities | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 86,028 | 8,996
U.S. government debt securities | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 0 | 0
Other |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 264 | 264
Other | Quoted Prices in Active Markets (Level 1) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 0 | 0
Other | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | 264 | 264
Other | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Fair value of financial assets measured at fair value on a recurring basis | $ 0 | $ 0

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=pgen_OtherFinancialAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |