Commitment and Contingencies - Schedule of Weighted Average IBR and Remaining Lease Term (Details)	Dec. 31, 2020
Long Term Purchase Commitment [Line Items]
Weighted Average IBR	7.20%
Remaining Terms (in years)	8 years 4 months 24 days
Redwood City, CA
Long Term Purchase Commitment [Line Items]
Weighted Average IBR	6.90%
Remaining Terms (in years)	9 years 2 months 12 days
Boston, MA
Long Term Purchase Commitment [Line Items]
Weighted Average IBR	9.30%
Remaining Terms (in years)	5 years 7 months 6 days
Menlo Park, CA
Long Term Purchase Commitment [Line Items]
Weighted Average IBR	6.80%
Remaining Terms (in years)	1 year 3 months 18 days