Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Accrued Liabilities Current [Abstract]
Accrued personnel expenses	$ 7,128	$ 8,632
Professional fees	67	295
Other	341	616
Total	$ 7,536	$ 9,543	[1]

[1] The Condensed Consolidated Balance Sheet as of December 31, 2020 has been derived from the audited financial statements as of that date.