Leases (Tables)

3 Months Ended

Mar. 31, 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:

	March 31, 2021			December 31, 2020
Remaining lease term	7.0 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 March 31, 2021 for each of the years ending December 31 are as follows (in thousands):

Undiscounted lease payments:
Remaining 2021	$	1,704
2022		2,340
2023		2,410
2024		2,483
2025		2,557
Thereafter		6,277
Total undiscounted lease payments		17,771
Less: imputed interest		(5,153	)
Total operating lease liability	$	12,618

Watertown Lease

Lessee Lease Description [Line Items]

Summary of Lease Costs

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

	Three Months Ended March 31,
	2021		2020
Lease cost:
Operating lease cost	$	637	$	637
Variable lease cost		241		266
Total lease cost		878		903