Quarterly report pursuant to Section 13 or 15(d)

Sponsored Research and Clinical Trial Agreements - Additional Information (Detail)

v3.19.1
Sponsored Research and Clinical Trial Agreements - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Research and Development Expense $ 23,273 $ 24,958
University of Texas [Member] | Cellvation [Member]    
Research and Development Expense $ 100 $ 100