Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Sponsored Research and Clinical Trial Agreements - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Research and Development Expense (Excluding Acquired in Process Cost) $ 18,511 $ 17,488 $ 41,784 $ 42,446
University of Texas [Member] | Cellvation [Member]        
Research and Development Expense (Excluding Acquired in Process Cost) $ 100 $ 100 $ 100 $ 100