Leases (Tables)

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Lease, Cost

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

	Year Ended December 31,
	2019		2018		2017
Operating lease cost	$	14,697	$	7,972	$	4,515
Variable lease cost	6,408		4,497		3,077
Total lease costs	$	21,105	$	12,469	$	7,592

Future Minimum Lease Payments for Operating Leases

As of December 31, 2019, the maturities of our operating lease liabilities were as follows (in thousands):

Year ending December 31,
2020	$	14,571
2021	19,219
2022	19,832
2023	20,461
2024	21,110
2025 and thereafter	118,058
Total lease payments	213,251
Less: portion representing interest	(54,741		)
Less: lease incentives	(3,264		)
Operating lease liabilities	155,246
Less: current portion	(12,516		)
Operating lease liabilities, less current portion	$	142,730

Schedule of Future Minimum Rental Payments for Operating Leases

Under the historical guidance of ASC 840, our deferred rent balance at December 31, 2018 totaled $9.3 million and our future minimum lease payments for our operating leases at December 31, 2018 were as follows (in thousands):

Year ending December 31,
2019	$	7,914
2020	10,617
2021	13,649
2022	14,117
2023	14,599
2024 and thereafter	98,315
Total future minimum lease payments	$	159,211