The Company leases office space and equipment, and certain office space is subleased. Management determines if a contract is a lease at the inception of the arrangement and reviews all options to extend, terminate, or purchase its right-of-use assets at the inception of the lease and accounts for these options when they are reasonably certain of being exercised.

Leases with an initial term of greater than twelve months are recorded on the consolidated balance sheet. Lease expense is recognized on a straight-line basis over the lease term.

The Company’s lease contracts generally do not provide a readily determinable implicit rate. For these contracts, the estimated incremental borrowing rate is based on information available at the inception of the lease.

During the second quarter of 2019, the Company extended the lease term on its Pittsburgh, PA headquarters, which resulted in a net increase in right-of-use assets and lease liabilities of approximately $3.0 million. Additionally, an office lease in Aliso Viejo, CA commenced during the quarter, which increased right-of-use assets and lease liabilities by approximately $1.5 million.

	For the Three Months Ended June 30, 2019			For the Six Months Ended June 30, 2019
	(unaudited)			(unaudited)
Lease cost	$	436		$	790
Sublease income		(151	)		(301	)
Total lease cost	$	285		$	489

Operating lease assets and liabilities are summarized as follows (in thousands):

	As of June 30, 2019
	(unaudited)
Right-of-use assets	$	6,708

Current lease liabilities	$	1,057
Long-term lease liabilities		6,135
Total lease liabilities	$	7,192

The maturity of operating lease liabilities is presented in the following table (in thousands):

	As of June 30, 2019
	(unaudited)
2019	$	685
2020		1,662
2021		1,639
2022		1,220
2023		1,231
Thereafter		2,343
Total lease payments		8,780
Less imputed interest		1,588
Present value of lease liabilities	$	7,192