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AbbVie Collaboration Agreement - Additional Information (Detail) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 18, 2018 USD ($) | Sep. 27, 2018 USD ($) Milestone | May 31, 2017 USD ($) | Dec. 31, 2015 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Feb. 28, 2019 USD ($) | Dec. 31, 2018 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Recognition of revenue |  |  |  |  | $ 338 | $ 354 |  |
Long term deferred revenue |  |  |  |  | 465 |  |  |
Current deferred revenue |  |  |  |  | 1,964 |  |  | $ 268
AbbVie Agreement |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Number of mile stone payments under second phase | Milestone |  | 2 |  |  |  |  |  |
Initial milestone payment upon execution of amendment |  | $ 2,000 |  |  |  |  |  |
Increase in transaction price of performance obligation of second phase | $ 2,000 |  |  |  |  |  |  |
Remaining milestone achieved |  |  |  |  |  |  | $ 2,500 |
Recognition of revenue |  |  |  |  | 300 | $ 400 |  |
Long term deferred revenue |  |  |  |  | 2,000 |  |  |
Current deferred revenue |  |  |  |  | 500 |  |  |
AbbVie Agreement | IBDCo |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Upfront non refundable payment |  |  |  | $ 2,000 |  |  |  |
Potential milestone payment |  |  |  |  | $ 16,500 |  |  |
Collaboration in research and development |  |  |  |  | 54 months |  |  |
Milestone payment |  |  | $ 2,000 |  |  |  |  |

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