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Commitments and Contingencies - Narratives (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
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Oct. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2018 unit | Jun. 30, 2018
Loss Contingencies |  |  |  |  |  |  |  |  |  |
Gain on termination of operating lease |  |  |  |  | $ 160,000 | $ 0 |  |  |  |
Lease Incentive Receivable |  |  | $ 1,200,000 |  | $ 1,200,000 |  |  |  |  |
Imperial (Forest House) Limited |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |
Gain on termination of operating lease |  |  | $ 1,300,000 |  |  |  |  |  |  |
Office and Manufacturing Space in Rockville, Maryland |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |
Leasehold improvements |  |  |  |  |  |  | $ 2,200,000 |  |  |
Building | Imperial (Forest House) Limited |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |
Operating lease contract term |  |  | 10 years |  | 10 years |  |  |  |  |
Building | Therapy Catapult Manufacturing Center in Stevenage, United Kingdom |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |
Operating lease rent free period |  | 6 months |  |  |  |  |  |  |  |
Building | Laboratory Space in White City, London |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |
Operating lease contract term |  |  |  |  |  |  |  |  |  | 10 years
Building | Manufacturing Space in Enfield, United Kingdom |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |
Operating lease contract term |  |  |  |  |  |  |  |  | 15 years |
Number of units (units) | unit |  |  |  |  |  |  |  |  | 3 |
Leasehold improvements |  |  |  |  |  |  |  | $ 4,100,000 |  |
Building | Office Space In Rockville, Maryland |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |
Gain on termination of operating lease |  |  |  | $ 200,000 |  |  |  |  |  |
Operating lease rent free period | 5 years |  |  |  |  |  |  |  |  |
Additional Space | Imperial (Forest House) Limited |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |
Operating lease contract term |  |  | 15 months |  | 15 months |  |  |  |  |
Licensing Agreements |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  | $ 600,000 |  | $ 600,000 |  |  |  |  |

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