The Company’s leases relate primarily to office facilities that expire on various dates from 2019 through 2027. The terms of the Company's non-cancelable operating lease arrangements typically contain fixed lease payment which increases over the term of the lease at fixed rates, rent holidays and provide for additional renewal periods. Lease expense is recognized over the term of the lease on a straight-line basis. All of the Company’s leases are classified as operating leases. The Company has determined that periods covered by options to extend the Company’s leases are excluded from the lease term as the Company is not reasonably certain the Company will exercise such options. Operating lease expense, including expenses related to short-term leases, were $1.2 million and $0.9 million for the three months ended September 30, 2019 and 2018, respectively, and $3.5 million and $2.6 million for the nine months ended September 30, 2019 and 2018, respectively.

The Company records its ROU Assets within other assets (long term) and its operating lease liabilities within other current and long-term liabilities.

Additional information related to the Company’s leases as of and for the nine months ended September 30, 2019, is as follows (in thousands, except lease term and discount rate):

	September 30, 2019
Balance sheet information
ROU assets	$	13,824
Lease liabilities, current	$	3,514
Lease liabilities, non-current		12,714
Total lease liabilities	$	16,228
Supplemental data
Weighted average remaining lease term	4.33 years
Weighted average discount rate		7.00	%
Cash paid for amounts included in lease liabilities	$	2,648
ROU assets obtained in exchange for lease obligations	$	17,726

Maturities of lease liabilities as of September 30, 2019 were as follows (in thousands):


Year ending December 31,
2019 (for the remaining three months)	$	1,160
2020		4,487
2021		4,341
2022		4,044
2023		3,929
Thereafter		2,023
Total undiscounted lease payments		19,984
Less: imputed interest		(3,756	)
Total lease liabilities	$	16,228

The following table presents components of lease expense for the three and nine months ended September 30, 2019 (in thousands):

	Three Months Ended			Nine Months Ended
	September 30, 2019			September 30, 2019
Operating lease expense	$	1,069		$	2,802
Short-term lease expense⁽¹⁾		138			690
		1,207			3,492
Less: Sublease income		(33	)		(45	)
Total lease expense	$	1,174		$	3,447

As of September 30, 2019, we do not have any leases that have not yet commenced that create significant rights and obligations.

Future minimum lease payments under non-cancelable operating leases, including short-term leases as of September 30, 2019 were as follows (in thousands):


2019 (for the remaining three months)	$	1,221
2020		4,612
2021		4,341
2022		4,044
2023		3,929
Thereafter		2,023
Total minimum lease payments	$	20,170