Leases

6 Months Ended

Jun. 30, 2020

We have operating leases for office space, laboratory operations, research and development facilities, manufacturing locations, warehouses and certain equipment. We determine if a contract contains a lease at inception or modification of a contract. Our leases generally do not provide an implicit interest rate, and we therefore use our incremental borrowing rate as the discount rate when measuring operating lease liabilities. The incremental borrowing rate represents an estimate of the interest rate we would incur at lease commencement to borrow an amount equal to the lease payments on a collateralized basis over the term of the lease within a particular currency environment. We used the incremental borrowing rates as of January 1, 2019 for operating leases that commenced prior to that date. Many of our leases contain rental escalation, renewal options and/or termination options that are factored into our determination of lease payments as appropriate. Variable lease payment amounts that cannot be determined at the commencement of the lease are not included in the right-to-use assets or liabilities.

The following table presents the lease balances within the Condensed Consolidated Balance Sheet as of June 30, 2020:


(in thousands)	Classification on the Balance Sheet	June 30, 2020			December 31, 2019
Assets
Operating lease assets	Operating lease right-of-use assets	$	38,469		$	39,380
Finance lease assets	Property, plant and equipment, net	5,395			6,789

Liabilities
Current
Operating lease liabilities	Current maturities of operating leases	10,298			12,038
Accrued expenses	Current maturities of finance leases	2,435			2,743
Long-term
Operating lease liabilities	Operating lease liabilities	28,759			27,665
Other long-term liabilities	Finance lease liabilities	$	2,960		$	4,046

Weighted average remaining lease term
Operating leases		5.7 years			5.6 years
Finance leases		2.5 years			2.6 years
Weighted average discount rate
Operating leases		6.4		%	6.3		%
Finance leases		3.9		%	3.0		%

The following table reconciles the undiscounted future minimum lease payments (displayed by year and in the aggregate) under noncancelable operating leases with terms of more than one year to the total operating lease liabilities recognized on our Condensed Consolidated Balance Sheet as of June 30, 2020:


(in thousands)	Operating		Finance
July 1, 2020 through December 31, 2020	$	6,604	$	1,404
2021	7,479		2,186
2022	6,506		1,175
2023	5,845		590
2024	4,671		249
Thereafter	17,374		—
Total undiscounted future minimum lease payments	48,479		5,604
Less: Difference between lease payments and discounted lease liabilities	9,422		209
Total lease liabilities	$	39,057	$	5,395

Expense under operating leases and finance leases was $9.7 million and $1.2 million, respectively, for the six months ended June 30, 2020, which includes $1.6 million of variable lease costs. Expense under operating leases and finance leases was $9.8 million and $2.0 million, respectively, for the six months ended June 30, 2019, which includes $1.7 million of variable lease costs. Operating lease costs and finance lease costs are included within Operating loss in the Condensed Consolidated Statement of Operations. Short-term lease costs were not material.

Supplemental cash flow information is as follows:


(in thousands)	For the six months ended June 30,
	2020		2019
Operating cash out flows from operating leases	$	9,804	$	10,804
Operating cash out flows from finance leases	86		234
Financing cash out flows from finance leases	1,026		1,590
Total	$	10,916	$	12,628