OPERATING LEASES (Tables)

12 Months Ended

Dec. 31, 2021

Leases [Abstract]

Components of lease costs

The components of lease costs included in operating expenses for the Menlo Park Lease, New Jersey Lease and the Foster City Lease on our statements of operations were as follows:

	Year Ended December 31,
(In thousands)	2021		2020		2019
Operating lease costs	$	946	$	1,143	$	783
Variable lease costs (1)		252		293		17
Total lease costs	$	1,198	$	1,436	$	800

(1) Variable lease costs represent non-lease components, such as common area maintenance charges.

Undiscounted future non-cancellable lease payments

The undiscounted future non-cancellable lease payments under the New Jersey Lease and the Foster City Lease as of December 31, 2021 were as follows (in thousands): 

2022	$	937
2023		962
2024		988
2025		1,014
2026		1,040
Thereafter		1,767
Total lease payments		6,708
Less: imputed interest		(1,540	)
Total	$	5,168