8. Leases

We adopted ASU 2016-02—Leases (Topic 842) as of January 1, 2019, using the new transition method issued under ASU 2018-11, which allows an entity to initially apply the new leases standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption and also allows an entity to elect not to recast its comparative periods in transition. In addition, we elected to use the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed us to carry forward the historical lease classification. We also elected to use the practical expedient related to short-term leases, allowing us to not recognize right-of-use assets and lease liabilities for leases with a lease term of 12 months or less. As of March 31, 2020, short-term leases were not material. As of March 31, 2020, finance leases were not material and are therefore not included in the following disclosures.

Operating lease expense for the three months ended March 31, 2020 and 2019 was $1.0 million and $0.7 million, respectively.

Supplemental cash flow information related to leases was as follows (in thousands):


	Three months ended March 31,
	2020		2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	1,004	$	737

Supplemental balance sheet information related to leases was as follows (in thousands):


	March 31,			December 31,
	2020			2019
Operating leases:
Operating lease right-of-use assets	$	12,097	$	12,645

Accrued expenses and other current liabilities		2,964		2,772
Operating lease liabilities		10,112		10,863
Total operating lease liabilities	$	13,076	$	13,635

Weighted average remaining lease term:
Operating leases		4 years		4 years

Weighted average discount rate:
Operating leases		9%		9%

Maturities of operating lease liabilities as of March 31, 2020 were as follows (in thousands):


	Operating
	Leases
2020	$	3,007
2021		3,949
2022		3,829
2023		3,496
2024		1,336
Thereafter		—
Total lease payments	$	15,617
Less imputed interest		2,541
Total operating lease liabilities	$	13,076