From time to time, the Company is subject to claims and suits arising in the ordinary course of business. The Company accrues such liabilities when they are known, if they are deemed probable and can be reasonably estimated.

In April 2018, the Company entered into an operating lease for approximately nine thousand square feet of office space in Northbrook, IL, which expired in January 2020.

In June 2018, the Company entered into an operating lease for approximately fifteen thousand square feet of office space in Plymouth Meeting, PA, which expires in May 2024.

In December 2020, the Company entered into an operating lease for approximately thirteen thousand square feet of additional office space in Plymouth Meeting, PA, which expires in May 2024. The term will not commence until the Company takes occupancy in mid-2021.

The terms of the lease payments provide for rental payments on a monthly basis and on a graduated scale. The Company recognizes rent expense on a straight-line basis over the lease period and has accrued for rent expense incurred but not paid. In addition, tenant improvement allowances recorded are amortized as a reduction to rent expense on a straight-line basis over the lease term. Rent expense was $217 and $353 for the three and six months ended June 30, 2021, respectively, compared to $151 and $355 for the three and six months ended June 30, 2020, respectively. The following table sets forth the lease payment obligations as of June 30, 2021, for the periods indicated below:

Years ending December 31,
2021 (excluding the six months ended June 30, 2021)	$	267
2022		875
2023		892
2024		334
2025		—
Thereafter		—
Total	$	2,368