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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Accrued professional services $ 5,794 $ 931
Accrued payroll and related benefits 5,229 2,577
Accrued volume-based rebate and coupon liability 1,709 0
Other accrued expenses 1,228 210
Accrued expenses $ 13,960 $ 3,718