Property and Equipment

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property and equipment consisted of the following:



	As of December 31,
	2019			2018
	(In thousands)
Capitalized internal-use software development costs	$	100,155		$	72,647
Data center equipment ⁽¹⁾	22,009			—
Leasehold improvements	55,886			15,293
Office equipment	25,083			13,563
Furniture and fixtures ⁽¹⁾	10,095			4,918
Software	9,176			1,849
Total property and equipment	222,404			108,270
Less: accumulated depreciation and amortization	(81,148		)	(44,736		)
Total property and equipment, net	$	141,256		$	63,534

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⁽¹⁾Data center equipment and furniture and fixtures contain assets under finance leases. See Note 5 for further detail.

Depreciation and amortization expense was $37.5 million, $18.9 million and $13.1 million for the years ended December 31, 2019, 2018 and 2017, respectively.

The Company capitalized $29.7 million, $25.3 million and $21.5 million in internal‑use software development costs in the years ended December 31, 2019, 2018 and 2017, respectively, of which $7.8 million, $5.7 million and $4.2 million, respectively, was stock‑based compensation expense. Amortization of capitalized software development costs was $17.1 million, $13.0 million, and $8.4 million in the years ended December 31, 2019, 2018 and 2017, respectively. The amortization of the capitalized software development costs was allocated as follows:



	Year Ended December 31,
	2019		2018		2017
	(In thousands)
Cost of revenue	$	9,546	$	6,898	$	4,788
Research and development	7,345		5,437		3,619
General and administrative	213		689		—
Total	$	17,104	$	13,024	$	8,407