6. PROPERTY, PLANT AND EQUIPMENT AND LEASED FACILITIES AND EQUIPMENT

Property, plant and equipment

Property, plant and equipment consisted of the following at December 31, 2021 and 2020 (in thousands):

Depreciation expense for continuing operations for 2021 and 2020 was $4.1 million and $5.0 million, respectively. The decrease in depreciation expense for 2021 compared to 2020 was due to assets becoming fully depreciated.

Leased Facilities and Equipment

At December 31, 2021, our significant leases subject to long-term agreements were as follows:

At December 31, 2021, our lease asset, current lease liability and long-term lease liability were $0.9 million, $0.6 million and $1.4 million, respectively. As discussed above, we do not intend to exercise the renewal options for our Jennings Facility and Lake Charles Facility, and accordingly, our lease obligations for these facilities exclude the lease renewal options.

Future minimum payments under leases having initial terms of more than twelve months are as follows (in thousands):

Total lease expense for our leased facilities and equipment, which includes lease asset amortization expense and expense for leases with original terms that are twelve months or less, for 2021 and 2020, was $1.0 million and $0.9 million, respectively. Cash paid for leases for 2021 and 2020 was $1.5 million and $1.4 million, respectively.

The discount rate used to determine the present value of our lease liabilities was based on the interest rate on our LC Facility adjusted for terms similar to that of our leased properties. At December 31, 2021, our weighted-average remaining lease term was approximately 3.1 years and the weighted-average discount rate used to derive our lease liability was 6.7%.