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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 04, 2020 | Jun. 15, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Apr. 09, 2020
Loss Contingencies [Line Items] |  |  |  |  |  |
Lease arrangement, contractual expiration period, beginning year |  |  |  | 2021 |  |
Lease arrangement, contractual expiration period, ending year |  |  |  | 2028 |  |
Lessee, operating lease, existence of option to extend [true false] |  |  |  | true |  |
Lessee, operating lease, option to extend |  |  |  | These leases require monthly lease payments that may be subject to annual increases throughout the lease term. Certain lease agreements also provide the Company with the option to renew for additional periods ranging from one to five years. |  |
Cash paid for operating lease liabilities |  |  |  | $ 3.4 |  |
Rent expense |  |  | $ 1.2 |  | $ 3.2 |
Samsung Biologics Co., Ltd |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Obligated to pay capacity reservation |  |  |  |  |  | $ 362.0
WuXi Biologics |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Obligated to pay capacity reservation |  | $ 130.0 |  |  |  |
GSKTSL | WuXi Biologics MSA and Samsung MSA | Antibody Program |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Percentage of development costs | 72.50% |  |  |  |  |
GSK | WuXi Biologics MSA and Samsung MSA | Antibody Program |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Percentage of development costs | 27.50% |  |  |  |  |
Maximum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Lessee, operating lease, renewal term |  |  |  | 5 years |  |
Maximum | WuXi Biologics |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Percentage of estimated raw material costs |  | 80.00% |  |  |  |
Minimum [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Lessee, operating lease, renewal term |  |  |  | 1 year |  |
Minimum [Member] | WuXi Biologics |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Percentage of estimated raw material costs |  | 70.00% |  |  |  |

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- Definition Indicates (true false) whether lessee has option to extend operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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