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Commitments and Contingencies - Narrative (Details) ft² in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2021 USD ($) ft² | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Sublease income |  | $ 1,000,000.0 | $ 900,000 | $ 2,900,000 | $ 2,800,000 |
DMSA |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Purchase order executed |  | 42,000,000 |  | 42,000,000 |  | $ 33,000,000
Non-refundable purchase commitments |  | 27,600,000 |  | 27,600,000 |  | $ 27,100,000
Costs incurred |  | 5,800,000 | 1,400,000 | 14,200,000 | 6,200,000 |
Payments for development and manufacturing services |  | 4,000,000 | $ 800,000 | 10,400,000 | $ 6,000,000 |
Operating Lease, 8 Year Lease Agreement | Building |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Lease not yet commenced, area under lease | ft² | 50 |  |  |  |  |
Lease not yet commenced, period | 8 years 4 months 24 days |  |  |  |  |
Lease not yet commenced, undiscounted lease payments | $ 12,500,000 |  |  |  |  |
Lease not yet commenced, lease liability |  | 0 |  | 0 |  |
Lease not yet commenced, ROU asset |  | 0 |  | 0 |  |
Lease not yet commenced, operating lease expense |  | $ 0 |  | $ 0 |  |

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