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Development, Commercialization and Supply Agreement - Changes in Balances of Contract Assets and Liabilities (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Contract liabilities:    
Deferred revenue, Balance at Beginning of Period $ 20,710 $ 19,054
Deferred revenue, Additions   2,500
Deferred revenue, Deductions (1,131) (598)
Deferred revenue, Balance at End of Period $ 19,579 $ 20,956