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Leases
 3 Months Ended
Mar. 31, 2021
Leases [Abstract]  
Leases Leases
 As a lessee, the Company’s current leases include its master facility lease and immaterial equipment leases, all of which are considered operating leases.

The Company (as a sublessor) also subleases portions of its facility to third parties under three separate subleases. All of these subleases have been determined to be operating leases and are accounted for separately from the head lease.

Master Facility Lease

The Company leases a building in San Diego under an operating lease that expires on December 31, 2021. The lease currently requires fixed monthly rent payments of approximately $80,000, with 3% annual escalation. The Company is currently in negotiations to lease lab and office space after our current lease expires.

Facility Subleases

As a result of corporate restructurings in previous years, the Company vacated a portion of its facility and has subleased the space to third parties under three separate sublease agreements, which all expire December 31, 2021.

The components of lease expense were as follows:
Three Months Ended March 31,
(in thousands)20212020
Operating lease cost$95 $107 
Operating sublease income(101)(73)
Net operating lease cost$(6)$34 

Supplemental balance sheet information related to leases was as follows:
(in thousands)As of March 31,
2021		As of December 31,
2020
Operating lease ROU assets$261 $343 
Current operating lease liabilities$635 $860 
Non-current operating lease liabilities8 9 
Total operating lease liabilities$643 $869 
Weighted-average remaining lease term–operating leases0.8 years1.0 year
Weighted-average discount rate–operating leases6.5 %6.5 %

Supplemental cash flow and other information related to leases was as follows:
Three Months Ended March 31,
(in thousands)20212020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$240 $233 

Total remaining annual commitments under non-cancelable lease agreements for each of the years ended December 31 are as follows:
(in thousands)
Year Ending December 31, Operating Leases  Sublease Income  Net Operating Leases
2021 (excluding the three months ended March 31, 2021)$650 $(303)$347 
20226 — 6 
20233 — 3 
Total future minimum lease payments659 $(303)$356 
Less imputed interest(16)
Total$643 
Leases Leases
 As a lessee, the Company’s current leases include its master facility lease and immaterial equipment leases, all of which are considered operating leases.

The Company (as a sublessor) also subleases portions of its facility to third parties under three separate subleases. All of these subleases have been determined to be operating leases and are accounted for separately from the head lease.

Master Facility Lease

The Company leases a building in San Diego under an operating lease that expires on December 31, 2021. The lease currently requires fixed monthly rent payments of approximately $80,000, with 3% annual escalation. The Company is currently in negotiations to lease lab and office space after our current lease expires.

Facility Subleases

As a result of corporate restructurings in previous years, the Company vacated a portion of its facility and has subleased the space to third parties under three separate sublease agreements, which all expire December 31, 2021.

The components of lease expense were as follows:
Three Months Ended March 31,
(in thousands)20212020
Operating lease cost$95 $107 
Operating sublease income(101)(73)
Net operating lease cost$(6)$34 

Supplemental balance sheet information related to leases was as follows:
(in thousands)As of March 31,
2021		As of December 31,
2020
Operating lease ROU assets$261 $343 
Current operating lease liabilities$635 $860 
Non-current operating lease liabilities8 9 
Total operating lease liabilities$643 $869 
Weighted-average remaining lease term–operating leases0.8 years1.0 year
Weighted-average discount rate–operating leases6.5 %6.5 %

Supplemental cash flow and other information related to leases was as follows:
Three Months Ended March 31,
(in thousands)20212020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$240 $233 

Total remaining annual commitments under non-cancelable lease agreements for each of the years ended December 31 are as follows:
(in thousands)
Year Ending December 31, Operating Leases  Sublease Income  Net Operating Leases
2021 (excluding the three months ended March 31, 2021)$650 $(303)$347 
20226 — 6 
20233 — 3 
Total future minimum lease payments659 $(303)$356 
Less imputed interest(16)
Total$643