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Inventory - Additional Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory [Line Items]    
Prepayment made for manufacturing services $ 8,249 $ 7,906 [1]
Contract Manufacturing Organization    
Inventory [Line Items]    
Prepayment made for manufacturing services $ 7,300 $ 6,600
[1] The consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated balance sheet included in the Company’s 2018 Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 28, 2019.