Balance Sheet Components

12 Months Ended

Dec. 31, 2018

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Components

4. Balance Sheet Components

Property and Equipment, net

Property and equipment, net consists of the following:

	December 31,
	2018			2017
	(in thousands)
Computer hardware and software	$	2,148		$	1,090
Furniture and equipment		1,002			1,029
Leasehold improvements		4,709			2,967
		7,859			5,086
Less: Accumulated depreciation		(2,216	)		(1,073	)
	$	5,643		$	4,013

Depreciation expense for the years ended December 31, 2018, 2017 and 2016 was $1.1 million, $0.5 million and $0.3 million, respectively.

The useful life for computer hardware and software is three years, furniture and equipment is five years and leasehold improvements is the lesser of the useful life or the term of the respective lease.

Accrued Expenses

Accrued expenses consist of the following:

	December 31,
	2018		2017
	(in thousands)
Development costs	$	21,216	$	23,473
Employee-related expenses		19,638		15,838
Professional services		10,903		3,166
Other accrued expenses		237		124
	$	51,994	$	42,601