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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) l | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Maximum [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Bioreactors used in perfusion cell culture applications | 2,000 |  |  |
Minimum [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Bioreactors used in perfusion cell culture applications | 50 |  |  |
NGL Impact A [Member] | Research and Development Arrangement [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Payments to Navigo in connection with this program, which are recorded to research and development expenses | $ | $ 0.0 | $ 0.0 | $ 1.0 | $ 2.4

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- Definition It's represents about capacity of bioreactors. + References No definition available. + Details
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Namespace Prefix: | rgen_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

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- Definition Commitments and Contingencies [Line Items] + References No definition available. + Details
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Namespace Prefix: | rgen_
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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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