(7) Leases

The Company has operating leases of office, manufacturing and laboratory space, which have remaining lease terms of one to six years and may include one or more options to renew or terminate early.

During the first quarter of 2019, the Company amended its Hampton, New Jersey lease to eliminate 16,200 square feet of space and extend the remaining 33,400 square feet of space for an additional five-year term with an early termination option after three years. The Company recorded an additional right-of-use asset and lease liability of $1.4 million during the first quarter of 2019 for the initial 3 years related to the amendment.

Operating lease expense and variable lease expense was $2.5 million and $1.5 million for year ended December 31, 2019, respectively. Under the prior lease accounting guidance, the Company recorded total operating lease expense and variable lease expense of $4.0 million and $4.1 million for the years ended December 31, 2018 and 2017, respectively. Cash paid for amounts included in the measurement of operating lease liabilities during the year ended December 31, 2019 was $3.3 million. As of December 31, 2019, the weighted-average remaining lease term was 2 years and the weighted-average discount rate was 11.0%.

Future minimum lease payments under non-cancellable leases as of December 31, 2019 were as follows:


2020	$	2,218
2021		875
2022		747
2023		311
Total lease payments		4,151
Less imputed interest		(494)
Present value of operating lease liabilities	$	3,657

Under the prior lease accounting guidance, operating lease obligations, including estimated variable lease obligations, as of December 31, 2018 were as follows:


2019	$	4,648
2020		3,140
Thereafter		—
Total lease payments	$	7,788