Collaborative arrangements - Summary of Revenue Recognized Related to Research and Development Services (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
|
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] | ||||
Revenue | $ 8,910 | $ 11,528 | $ 34,677 | $ 35,336 |
Celgene Corporation [Member] | bb21217 Research and Development Services [Member] | ||||
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] | ||||
Revenue | $ 721 | $ 721 | $ 2,163 | $ 2,163 |