Property and Equipment, Net

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

Property and equipment as of December 31, 2020 and 2021 were as follows (in thousands):


	As of December 31,
	2020		2021
Electronic equipment	$	11,429	$	12,761
Office and other equipment	6,152		9,423
Vehicles	12,775		21,043
Leasehold improvements	7,340		11,984
Construction in progress	225		5,258
Property and equipment, gross	37,921		60,469
Accumulated depreciation and amortization	(15,805)		(24,416)
Property and equipment, net	$	22,116	$	36,053

Depreciation and amortization expense was $5.6 million, $7.7 million, and $9.5 million for the years ended December 31, 2019, 2020, and 2021, respectively.

As of December 31, 2020 and 2021, property and equipment financed under capital leases was $4.5 million and $3.3 million, net of accumulated amortization of $1.5 million and $2.5 million, respectively.