Leases (Tables)

6 Months Ended

Jun. 30, 2021

Lessee Lease Description [Line Items]

Summary of Lease Term and Discount Rate Applied in Arriving at Lease Liability

The following table summarizes the lease term and discount rate applied in arriving at the lease liability:

	June 30, 2021			December 31, 2020
Remaining lease term	6.8 years			7.3 years
Discount rate		10	%		10	%

Undiscounted Minimum Future Lease Payments Under Non-cancelable Leases

Future lease payments under non-cancelable leases as of June 30, 2021 for each of the years ending December 31 are as follows (in thousands):

Undiscounted lease payments:
Remaining 2021	$	1,136
2022		2,340
2023		2,410
2024		2,482
2025		2,557
Thereafter		6,277
Total undiscounted lease payments		17,202
Less: imputed interest		(4,841	)
Total operating lease liability	$	12,361

10

Watertown Lease

Lessee Lease Description [Line Items]

Summary of Lease Costs

The elements of lease costs were as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Lease cost:
Operating lease cost	$	638	$	638	$	1,275	$	1,275
Variable lease cost		127		521		368		787
Total lease cost		765		1,159		1,643		2,062