Balance Sheet Details - Property Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 1,352	$ 28,796
Accumulated depreciation and amortization	(1,137)	(10,407)
Total property and equipment, net	215	18,389
Software and Software Development Costs [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, gross	733	733
Computer Equipment [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, gross	310	1,296
Furniture and Fixtures [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 309	2,598
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, gross		14,504
Lab Equipment [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, gross		$ 9,665