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Commitments and Contingencies - Additional Information (Details) $ in Thousands | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2019 USD ($) ft² renewal | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Oct. 31, 2018 USD ($) ft² | Aug. 31, 2018 USD ($) ft²
Operating Leased Assets [Line Items] |  |  |  |  |
Allowance for tenant improvements |  | $ 3,809 |  |  |
Letter of credit |  | 4,300 | $ 4,300 |  |
Cash paid for amounts included in measurement of lease liabilities |  | $ 1,400 |  |  |
Weighted average discount rate, percent |  | 8.34% |  |  |
Weighted average remaining lease term |  | 10 years 8 months 12 days |  |  |
Non-cancellable purchase commitments |  | $ 5,300 |  |  |
Newark |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease term | 188 months |  |  |  |
Allowance for tenant improvements | $ 2,900 |  |  |  |
Operating lease, option to extend term | 10 years |  |  |  |
Area of operating lease | ft² | 118,000 |  |  |  |
Number of options to extend lease | renewal | 2 |  |  |  |
127 Months Lease Term |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Area of office and laboratory | ft² |  |  |  |  | 68,000
Operating lease term |  |  |  |  | 127 months
Allowance for tenant improvements |  |  |  |  | $ 4,500
Operating lease, option to extend term |  |  |  |  | 7 years
124 Months Lease Term |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Area of office and laboratory | ft² |  |  |  | 14,943 |
Operating lease term |  |  |  | 124 months |
Allowance for tenant improvements |  |  |  | $ 800 |
Operating lease, option to extend term |  |  |  | 7 years |

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