Leases (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Components of Lease Costs Included in Operating Expenses

The components of lease costs, which we include in operating expenses in our Condensed Consolidated Statements of Operations, were as follows (in thousands):

	Three months ended September 30,				Nine months ended September 30,
	2019		2018		2019		2018
Operating lease cost	$	4,116	$	1,927	$	10,030	$	5,651
Variable lease cost	1,485		1,096		4,539		3,371
Total lease costs	$	5,601	$	3,023	$	14,569	$	9,022

Summary of Maturities of Operating Lease Liabilities

As of September 30, 2019, the maturities of our operating lease liabilities were as follows (in thousands):

Year ended December 31,
2019 (Three months ended)	$	2,400
2020	15,283
2021	19,026
2022	19,633
2023	20,257
2024	20,899
2025 and thereafter	116,881
Total lease payments	214,379
Less: portion representing interest	(56,621		)
Less: lease incentives	(3,341		)
Operating lease liabilities	154,417
Less: current portion	(9,318		)
Operating lease liabilities, less current portion	$	145,099