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v3.20.4

Related Parties - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 13, 2020 | May 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |  |  |
Cost sharing receivable |  |  | $ 1,049 | $ 132 |
Deferred revenue, noncurrent ($117,808 and $0 to a related party) |  |  | 122,830 | 12,022 |
Upfront cash payment |  |  | 175,000 |  |
Research and Development |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Reimbursed under cost-sharing provisions of arrangement |  |  | 3,446 | $ 0 | $ 0
Gilead Collaboration Agreement | Gilead |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Upfront cash payment | $ 175,000 |  | 175,000 |  |
Unconstrained consideration to be received |  |  | 100,000 |  |
Premium on stock purchased | $ 90,600 |  |  |  |
Stock Purchase Agreement | Gilead |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Issuance of common stock, shares | 5,963,029 |  |  |  |
Funds received for purchase of common stock |  |  | 200,000 |  |
Fair value of stock purchased |  |  | 109,400 |  |
Premium on stock purchased |  |  | $ 90,600 |  |
Gilead |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Percentage of outstanding common stock held |  |  | 13.00% |  |
Price per share |  | $ 27.50 |  |  |
Value of common stock issued |  | $ 56,700 |  |  |
Number of shares issued |  | 2,200,000 |  |  |
Cost sharing receivable |  |  | $ 900 |  |
Deferred revenue |  |  | 185,400 |  |
Deferred revenue, noncurrent ($117,808 and $0 to a related party) |  |  | 117,800 |  |
Future development and commercialization services contract liability |  |  | 9,700 |  |
Gilead | Research and Development |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Reimbursed under cost-sharing provisions of arrangement |  |  | 3,400 |  |
Gilead | Gilead Collaboration Agreement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue recognized |  |  | $ 70,500 |  |
Gilead | Stock Purchase Agreement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Issuance of common stock, shares | 5,963,029 |  |  |  |
Gilead | Maximum |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Right to purchase additional outstanding voting common stock percentage |  |  | 35.00% |  |

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