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Development, Commercialization and Supply Agreement - Changes in Balances of Contract Assets and Liabilities (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Contract liabilities:    
Deferred revenue, Balance at Beginning of Period $ 20,846 $ 20,710
Deferred revenue, Additions 3,750  
Deferred revenue, Deductions (4,382) (973)
Deferred revenue, Balance at End of Period $ 20,213 $ 19,737