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Inventory (Details) - USD ($)
$ in Thousands
4 Months Ended 12 Months Ended
Apr. 28, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]        
Raw materials   $ 3,852 $ 0  
Work in process   313 0  
Finished goods   201 0  
Total inventories   4,366 0  
Research and development $ 1,600 $ 83,076 $ 107,406 $ 68,280
Finished goods shelf life   30 months