Property and Equipment

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and Equipment

A summary of property and equipment as of December 31, 2019 and 2018 is as follows:

		December 31,
	Useful Lives (years)	2019			2018
Leasehold improvements	Shorter of lease term or economic life	$	28,141		$	19,285
Website and software development costs	2-3	27,602			19,948
Computer and office equipment	3	4,846			2,956
Software	3	595			595
Furniture	7	6,965			3,933
Construction in progress		475			—
Property and equipment, gross		68,624			46,717
Accumulated depreciation and amortization		(29,047		)	(21,530		)
Property and equipment, net		$	39,577		$	25,187

Depreciation and amortization expense for property and equipment amounted to $8,742, $7,977, and $6,688 for the years ended December 31, 2019, 2018, and 2017, respectively. We capitalized software development costs, including stock-based compensation, of $8,396, $5,796, and $4,887 during the years ended December 31, 2019, 2018, and 2017, respectively.