Balance Sheet Components

The following table shows the components of property and equipment as of the dates presented:

		March 31,			December 31,
	Estimated Useful Life	2019			2018
Software, including internally developed software	3 years	$	26,000		$	25,518
Computer equipment	3 to 4 years		22,721			22,714
Finance lease ROU assets	Shorter of useful life or lease term		5,067			5,067
Leasehold improvements	Shorter of useful life or lease term		4,645			4,778
Office equipment, furniture and fixtures	3 to 5 years		1,988			2,140
Total property and equipment			60,421			60,217
Less: Accumulated depreciation and amortization			(49,396	)		(48,402	)
Property and equipment, net		$	11,025		$	11,815

Finance lease ROU assets consist of computer equipment and were previously included in the Computer equipment line in filings for periods prior to the

three

months ended

March 31, 2019.

Depreciation and amortization of internally developed software for the

three

months ended

March 31, 2019

and

2018

was

$1,249

and

$1,755,

respectively.

The following table shows the components of accrued expenses and other current liabilities as of the dates presented:

	March 31,		December 31,
	2019		2018
Accrued salary and payroll-related expenses	$	2,454	$	3,695
Deferred strategic agreement revenues		1,463		934
Finance lease liabilities		1,103		1,249
Accrued liabilities		1,033		866
Income taxes payable		867		883
Advanced billings		697		859
Customer advances		471		432
Sales and use tax payable		50		244
Deferred rent		—		538
Other		828		932
Total accrued expenses and other current liabilities	$	8,966	$	10,632