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Development, Commercialization and Supply Agreement - Changes in Balances of Contract Assets and Liabilities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Contract liabilities:    
Deferred revenue, Balance at Beginning of Period $ 20,710 $ 19,054
Deferred revenue, Additions 2,500 2,500
Deferred revenue, Deductions (2,364) (843)
Deferred revenue, Balance at End of Period $ 20,846 $ 20,710