Accrued Expenses and Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current accrued expenses
Accrued payroll and other employee benefits	$ 6,843	$ 5,329
Accrued clinical trial related costs	4,126	5,976
Accrued other	3,813	3,392
Total current accrued expenses	$ 14,782	$ 14,697