Certain Financial Statement Caption Information - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accrued Liabilities Current [Abstract]
Accrued payroll and other employee benefits	$ 1,598	$ 1,215
Clinical studies	756	442
Other accruals	191	267
Accrued interest	69	71
Preclinical research	17	15
Total accrued expenses	$ 2,631	$ 2,010