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Cost of Sales (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Inventory      
Cost of product sales $ 5,166 $ 20,011 $ 11,885
Lower of cost or NRV adjustments 7,802 10,264 318
Cost of sales $ 12,968 $ 30,275 $ 12,203