Balance Sheet Components

Property and Equipment, Net

Property and equipment, net consisted of the following as of December 31, 2018 and 2017 (in thousands):



	2018			2017
Computer equipment and software	$	3,189		$	5,385
Internal-use software and platform development costs	6,287			2,318
Leasehold improvements	5,783			2,189
Office furniture and fixtures	2,545			1,550
Total property and equipment	17,804			11,442
Less: Accumulated depreciation	(6,989		)	(7,928		)
Property and equipment, net	$	10,815		$	3,514

Depreciation expense related to property and equipment was $2.2 million, $1.5 million, and $1.8 million for the years ended December 31, 2018, 2017, and 2016, respectively.

The Company capitalized $4.0 million and $0.5 million of internal-use software and platform development costs during the years ended December 31, 2018 and 2017, respectively. The Company did not capitalize any internal-use software and platform development costs for the year ended December 31, 2016. Amortization expense related to the capitalized internal-use software and platform development costs was $0.1 million for the year ended December 31, 2018. There was no amortization expense for the year ended December 31, 2017 related to the internal-use software and platform development costs as the underlying assets had not been placed into service as of December 31, 2017. Amortization expense related to internal-use software and platform development costs was $1.0 million for the year ended December 31, 2016.

Intangible Assets, Net

All of the Company’s identifiable intangible assets were acquired in March 2014 from the Elance-oDesk Combination. Intangible assets, net consisted of the following (in thousands):



	As of December 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trade names	$	2,293	$	2,293	$	—
User relationships	18,678		12,674		6,004
Developed technology	10,356		10,356		—
Domain names	529		529		—
Total	$	31,856	$	25,852	$	6,004



	As of December 31, 2017
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trade names	$	2,293	$	2,293	$	—
User relationships	18,678		10,006		8,672
Developed technology	10,356		10,356		—
Domain names	529		529		—
Total	$	31,856	$	23,184	$	8,672

Total amortization expense of intangible assets was $2.7 million and $2.7 million for the years ended December 31, 2018 and 2017, respectively. Amortization expense was included in general and administrative expenses. As of December 31, 2018, the remaining useful life for user relationships was 2.3 years.

Total amortization expense of intangible assets was $5.7 million for the year ended December 31, 2016, of which $2.9 million was included in cost of revenue related to developed technology and trade names. The remaining carrying amount of $2.6 million for developed technology was accelerated in 2016 when the Elance platform was decommissioned. Amortization for the user relationships of $2.7 million was included in general and administrative expenses for the year ended December 31, 2016.

As of December 31, 2018, the estimated future amortization expense for the acquired intangible assets is as follows (in thousands):



Year Ended December 31,	Estimated Amortization Expense
2019	$	2,668
2020	2,668
2021	668
Total	$	6,004

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following as of December 31, 2018 and 2017 (in thousands):



	2018		2017
Accrued compensation and related benefits	$	9,314	$	8,399
Accrued freelancer costs	2,465		134
Accrued indirect taxes	1,630		1,861
Accrued vendor expenses	6,002		4,198
Accrued payment processing fees	715		593
Other	822		845
Total accrued expenses and other current liabilities	$	20,948	$	16,030