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Collaboration and License Agreements - Additional Information (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 30, 2019 shares | Apr. 30, 2019 USD ($) Product | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) Obligation | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Revenue recognized |  |  | $ 1,541,000 | $ 224,000 | $ 2,899,000 | $ 224,000 |
Lilly Note | Series C Convertible Preferred Stock |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Conversion of convertible note payable to preferred stock | shares | 4,576,342 |  |  |  |  |  |
Research Collaboration and License Agreement with Eli Lilly |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Upfront fees received |  | $ 20,000,000 |  |  |  |  |
License agreement expiry period |  | 10 years |  |  |  |  |
Number of performance obligation | Obligation |  |  |  |  | 1 |  |
Period for expects performance obligation |  |  |  |  | 5 years |  |
Revenue recognized |  |  | 1,500,000 | $ 200,000 | $ 2,900,000 | $ 200,000 |
Deferred revenue |  |  | $ 17,620,000 |  | $ 17,620,000 |  | $ 18,940,000
Research Collaboration and License Agreement with Eli Lilly | Maximum |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Rights to antibody oligonucleotide conjugates for messengers RNA targets. | Product |  | 6 |  |  |  |  |
Development milestone payment eligible to receive per target |  | $ 60,000,000 |  |  |  |  |
Regulatory milestone payment eligible to receive per target |  | 140,000,000 |  |  |  |  |
Commercialization milestone payment eligible to receive |  | $ 205,000,000 |  |  |  |  |

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