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Accrued Expenses and Other Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accrued expenses and other liabilities    
Research and development related costs $ 814 $ 1,055
Payroll and related costs 3,747 4,049
Accounting, tax and audit services 500 470
Manufacturing and inventory 4,435 4,779
Accrued gross to net 3,482 662
Other 2,265 1,829
Total other current liabilities $ 15,243 $ 12,844