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Accounts Receivable, Net - Grant and Other Receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Certain Balance Sheet Accounts    
Trade receivables, net $ 3,771 $ 35,074
Sublease and other receivables 70 111
Total accounts receivables, net 3,841 35,185
Chargeback and product return allowances $ 1,200 $ 1,600