Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accrued Liabilities Current [Abstract]
Accrued personnel expenses	$ 2,566	$ 4,571
Accrued research and development expenses	6,798	4,572
Professional fees	323	183
Other	483	196
Total	$ 10,170	$ 9,522	[1]

[1] The Condensed Consolidated Balance Sheet as of December 31, 2019 has been derived from the audited financial statements as of that date.