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Collaboration Agreements - PCV/SAV Composition of the Total Transaction Price (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Remaining performance obligations | $ 87,225 |
PCVSAV Agreement |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Remaining performance obligations | 213,360 | $ 213,050
PCVSAV Agreement | Upfront payment |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Remaining performance obligations | 200,000 | 200,000
PCVSAV Agreement | Premium associated with the contemporaneous sale of Series H redeemable convertible preferred stock |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Remaining performance obligations | 13,050 | 13,050
PCVSAV Agreement | Reimbursement for clinical supply |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Remaining performance obligations | $ 310 | $ 0

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