Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2021

Commitments And Contingencies Disclosure [Abstract]

Schedule of Additional Information Related to Operating Leases

The following table contains additional information related to our operating leases:

Location	Approximate Square Footage	Commencement Dates	Expiration Dates
Seattle, WA	48,086	March 2019 to September 2020	December 2026 to April 2028
Cambridge, MA	56,859	March 2019 to May 2020	November 2025 to February 2028
South San Francisco, CA	66,075	December 2019 to September 2021	April 2024 to April 2030
Fremont, CA	163,193	July 2021	November 2031

Summary of Lease Costs

The following table summarizes the Company’s lease costs:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(in thousands)
Operating lease cost	$	4,303	$	2,750	$	11,368	$	7,870
Short-term lease cost		-		474		512		1,418
Variable lease cost		1,286		837		4,015		2,306
Total lease cost	$	5,589	$	4,061	$	15,895	$	11,594

Reconciliation of Undiscounted Operating Lease Cash Flows by Fiscal Year to Present Value of Operating Lease Liabilities

The following table reconciles the Company’s undiscounted operating lease cash flows by fiscal year, to the present value of the operating lease liabilities as of September 30, 2021 (in thousands):

2021 (remaining 3 months)	$	2,867
2022		17,511
2023		17,677
2024		17,036
2025		17,151
2026 and thereafter		98,614
Total undiscounted lease payments		170,856
Less: imputed interest		(67,513	)
Less: tenant improvement allowances		(4,438	)
Present value of operating lease liabilities	$	98,905