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Shareholders' Equity - Share Lending Agreement (Details) | 1 Months Ended
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Jul. 31, 2018 $ / shares shares
Equity [Abstract] |
Borrowed shares, number issued (in shares) | shares | 7,479,431
Share lending agreement, length of time for shares to be returned upon termination | 5 days
Borrowed shares, public offering price per share (in usd per share) | $ / shares | $ 13.37

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- Definition Share Lending Agreement, Length Of Time For Shares To Be Returned Upon Termination + References No definition available. + Details
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Namespace Prefix: | pgen_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- 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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- Definition Per share or per unit amount of equity securities issued. + References No definition available. + Details
Name: | us-gaap_SharesIssuedPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of shares of stock issued attributable to transactions classified as other. + References No definition available. + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration