The Company leases facilities and certain equipment under noncancelable operating leases with remaining lease terms of 0.1 year to 5.8 years, one of which includes an option to extend the lease for one five-year term. This optional period was not considered in the determination of the right-of-use asset or the lease liability as the Company did not consider it reasonably certain that it would exercise such option.

	Three Months Ended March 31,
	2020		2019
Operating lease cost	$	1,487	$	1,275

Supplemental cash flow information related to the Company’s leases were as follows (in thousands):

	Three Months Ended March 31,
	2020		2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	1,291	$	1,102
Right-of-use assets obtained in exchange for operating lease obligations:		276		11,751

The balance sheet classification of the Company’s lease liabilities was as follows (in thousands):

	March 31, 2020		December 31, 2019
Operating lease liabilities
Current portion included in accrued liabilities	$	2,909	$	3,434
Operating lease liabilities		6,090		6,361
Total operating lease liabilities	$	8,999	$	9,795

	Operating Leases
Remainder of 2020	$	2,338
Years ending December 31,
2021		2,720
2022		2,179
2023		1,317
2024		1,090
Thereafter		1,011
Total lease payments		10,655
Less:
Imputed interest		(1,656	)
Total operating lease liabilities	$	8,999

Operating lease liabilities are based on the net present value of the remaining lease payments over the remaining lease term. In determining the present value of lease payments, the Company uses its incremental borrowing rate based on the information available at the lease commencement date. As of March 31, 2020, the weighted average remaining lease term is 4.9 years and the weighted average discount rate used to determine the operating lease liability was 8.0%.

In the fourth quarter of 2018, the Company entered into an agreement to lease approximately 67,020 square feet of corporate office space in San Diego, California with total minimum lease payments of $50.4 million over an initial term of 10 years and 9 months. In February 2020, the Company entered into the first amendment to this lease agreement to lease approximately 30,608 square feet of additional corporate office space in San Diego, California with total minimum lease payments of $25.3 million over an initial term of approximately 10 years and 7 months. In March 2020, the Company entered into the second amendment to the lease agreement which increased the total minimum lease payments of the original 67,020 square feet of corporate office space to $51.4 million. As of March 31, 2020, the lease had not yet commenced. This operating lease is expected to commence in the third quarter of 2020, but may commence earlier if the lessor makes the space available for use earlier than anticipated. In connection with this lease and its amendment agreements, the Company established a letter of credit for $3.1 million, which has automatic annual extensions and is fully secured by restricted cash.