Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accrued Liabilities And Other Liabilities [Abstract]
Accrued compensation	$ 1,733	$ 3,712
Accrued contracted research and development costs	7,751	8,620
Accrued professional and consulting fees	1,100	1,074
Other	367	464
Total accrued and other current liabilities	$ 10,951	$ 13,870