Quarterly report pursuant to Section 13 or 15(d)

Collaboration and License Agreements - Summary of Reconciliation of Deferred Costs Related To Collaboration Agreement (Detail)

v3.19.2
Collaboration and License Agreements - Summary of Reconciliation of Deferred Costs Related To Collaboration Agreement (Detail) - Collaboration Agreement [Member]
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]  
Balance at December 31, 2018 $ 310
Costs recognized (259)
Balance at June 30, 2019 $ 51