Accrued Expenses and Other Current Liabilities - Schedule of Composition of Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accrued clinical and related costs	$ 2,753	$ 819
Accrued compensation and related costs	2,260	1,746
Accrued interest	69	84
Operating lease liability, short-term	459	265
Accrued other	390	266
Accrued expenses and other current liabilities	$ 5,931	$ 3,180