Quarterly report pursuant to Section 13 or 15(d)

Research and Development Agreements - Schedule of Deferred Revenue and Accounts Receivable Balances from the Research and Development Agreements (Detail)

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Research and Development Agreements - Schedule of Deferred Revenue and Accounts Receivable Balances from the Research and Development Agreements (Detail) - Takeda Pharmaceuticals Inc - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Assets    
Unbilled revenue $ 0 $ 240
Liabilities    
Deferred revenue, current 14,561 26,231
Deferred revenue, non-current 1,664 2,670
Total deferred revenue $ 16,225 $ 28,901