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Inventory (Details) - USD ($)
$ in Thousands
3 Months Ended 4 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Apr. 28, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Inventory Disclosure [Abstract]            
Raw materials $ 4,257     $ 4,257   $ 3,852
Work in process 636     636   313
Finished goods 653     653   201
Total inventories 5,546     5,546   $ 4,366
Research and development $ 26,804 $ 20,997 $ 1,600 $ 75,979 $ 60,176  
Finished goods shelf life       36 months