The Company’s leases relate primarily to office facilities that expire on various dates from 2019 through 2024. 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 our leases are excluded from the lease term as the Company is not reasonably certain we will exercise such options. Operating lease expense, including expenses related to short-term leases, were $1.1 million and $0.9 million for the three months ended June 30, 2019 and 2018, respectively. Operating lease expense, including expenses related to short-term leases, were $2.3 million and $1.6 million for the six months ended June 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 six months ended June 30, 2019, is as follows:

(in thousands, except lease term and discount rate)	June 30, 2019
Balance sheet information
ROU assets	$	14,660
Lease liabilities, current	$	3,503
Lease liabilities, non-current		13,637
Total lease liabilities	$	17,140
Supplemental data
Weighted average remaining lease term	4.75 years
Weighted average discount rate		7.00	%
Cash paid for amounts included in lease liabilities	$	1,286
ROU assets obtained in exchange for lease obligations	$	22,379

(in thousands)	June 30, 2019
Year ending December 31,
2019 (for the remaining six months)	$	2,320
2020		5,233
2021		4,953
2022		3,890
2023		3,776
Thereafter		1,354
Total undiscounted lease payments		21,526
Less: imputed interest		(4,386	)
Total lease liabilities	$	17,140

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

	Three Months Ended			Six Months Ended
	June 30, 2019			June 30, 2019
Operating lease expense	$	991		$	1,733
Short-term lease expense(a)		151			552
		1,142			2,285
Less: Sublease income		(9	)		(12	)
Total lease expense	$	1,133		$	2,273

As of June 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 June 30, 2019 were as follows (in thousands):

	Amounts
2019 (for the remaining six months)	$	2,320
2020		5,233
2021		4,953
2022		3,890
2023		3,776
2024 and thereafter		1,354
Total minimum lease payments	$	21,526