Note 7 – Leases

The Company has operating leases for its research and development and manufacturing facilities, corporate headquarters and offices and certain equipment. At December 31, 2019, the facility leases have expirations that range from approximately 4 year to 7 years, some of which include options to extend the leases or terminate the leases early. Options to extend the leases or terminate the leases early are only included in the lease term when it is reasonably certain that the option will be exercised. The facility leases contain provisions for future rent increases, and obligate the Company to pay building operating costs. Upon closing of the Catalent transaction in July 2019, the Company assigned two of its manufacturing facility leases to Catalent (see Note 9). As a result, the Company wrote-off the corresponding right-of-use (“ROU”) assets of $8.2 million and the associated lease liabilities of $12.7 million.

Supplemental balance sheet information related to leases as of December 31, 2019 was as follows (in thousands, except weighted-average remaining lease term and discount rate):


Lease Assets and Liabilities	Classification	Amount
Assets:
Operating lease ROU assets	Other non-current assets	$	6,454

Liabilities:
Current operating lease liabilities	Other current liabilities	$	1,262
Non-current operating lease liabilities	Other non-current liabilities		10,004
Total operating lease liabilities		$	11,266

Weighted-average remaining lease term (years)			5.99
Weighted-average discount rate			15.58	%

Lease expense for the operating and short-term leases for the year ended December 31 was as follows (in thousands):


	2019
Operating lease expense	$	3,952
Short-term lease expense		434
Total lease expense	$	4,386

Total facility rent expense was approximately $5.0 million and $8.4 million for the years ended December 31, 2018 and 2017, respectively.

Supplemental cash flow information related to leases for the year ended December 31, 2019 was as follows (in thousands):


	Amount
Cash paid for amounts included in the measurement of operating lease liabilities	$	5,060
ROU assets obtained in exchange for operating lease obligations		16,534

As of December 31, 2019, maturities of lease liabilities were as follows (in thousands):


Year	Amount
2020	$	2,927
2021		2,993
2022		3,061
2023		2,921
2024		1,922
Thereafter		3,825
Total operating lease payments		17,649
Less: imputed interest		(6,383)
Total operating lease liabilities	$	11,266