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Commitments and Contingencies - Narrative (Details) ft² in Thousands, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Apr. 30, 2021 ft² | Dec. 31, 2020 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |  |
Not yet commenced, renewal term | 127 months 15 days |  |  |  |  |  |
Annual base rent | $ 0.9 |  |  |  |  |  |
Abatement period | 9 months |  |  |  |  |  |
Lease payments, annual increase, final year total | $ 1.2 |  |  |  |  |  |
Tenant incentives | $ 2.4 |  |  |  |  |  |
Current renewal term | 5 years |  |  |  |  |  |
Amount of square footage | ft² |  |  |  |  |  | 25 |
Lease term |  |  |  |  |  | 11 years |
Rent expense |  | $ 0.7 | $ 0.2 | $ 1.5 | $ 0.5 |  |
Purchase obligations outstanding |  | 7.2 |  | 7.2 |  |  | $ 3.1
Facility Lease Agreement Letter of Credit | Letter of Credit |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Letter of credit issued |  | $ 0.5 |  | $ 0.5 |  |  | $ 0.5

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