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Commitments and Contingencies - Schedule of Potential Milestone Amounts and Accruals (Detail)
$ in Thousands
Sep. 30, 2021
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
Potential Fixed Monetary Amount Settlement in Cash $ 10,799
Potential Fixed Monetary Amount Settlement in Stock 121,128 [1]
Potential Fixed Monetary Amount Settlement in Cash or stock at our sole discretion 108,928
Total Potential Fixed Monetary Settlement Amount 240,855
Accrued Amount Settlement in Cash 985 [2]
Accrued Amount Settlement in Stock 11,973 [1],[2]
Accrued Amount Settlement in Cash or stock at our sole discretion 3,949 [2]
Total Accrued Settlement Amount $ 16,907 [2]
[1] Includes the performance-based milestone awards that were granted as part of the Exchange Program further discussed in Note 15.
[2] Amount recorded for performance-based milestone awards that are probable of achievement.