Accrued Expenses and Other Current Liabilities - Schedule of Composition of Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued clinical and related costs	$ 819	$ 1,358
Accrued compensation and related costs	1,746	914
Accrued interest	84	194
Operating lease liability, short-term	265	0
Accrued other	266	305
Accrued expenses and other current liabilities	$ 3,180	$ 2,771