Leases - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Short-term lease cost	$ 444	$ 851
Emeryville, California lease
Lessee, Lease, Description [Line Items]
Additional renewal term	5 years