Goodwill and Acquired Intangible Assets, Net (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the Carrying Amounts of Goodwill

The changes in the carrying amounts of goodwill was as follows (in thousands):

At January 1, 2017	$	9,725
Additions from acquisitions	149,041
At December 31, 2017	158,766
Additions from acquisitions	11,023
Measurement period and other adjustments	771
At December 31, 2018	$	170,560

Acquired Intangible Assets

Acquired intangible assets consisted of the following as of the dates indicated (in thousands):

	December 31, 2018
	Cost		Accumulated Amortization		Net Book Value		Weighted- average remaining useful life (years)
Developed technology	$	19,096	$	18,628	$	468	0.8
Customer relationships	74,484		14,979		59,505		6.2
Tradenames	1,600		1,600		—
Acquired intangible assets, net	$	95,180	$	35,207	$	59,973

	December 31, 2019
	Cost		Accumulated Amortization		Net Book Value		Weighted- average remaining useful life (years)
Developed technology	$	19,096	$	19,062	$	34	0.2
Customer relationships	74,484		25,360		49,124		5.2
Tradenames	1,600		1,600		—
Acquired intangible assets, net	$	95,180	$	46,022	$	49,158

Amortization Expense Related to Acquired Intangible Assets

The Company recorded amortization expense related to acquired intangible assets as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
Cost of net revenue	$	434	$	11,834	$	5,083
Sales, marketing and support	10,381		10,236		4,570
General and administrative	—		1,098		590
Total amortization of acquired intangible assets	$	10,815	$	23,168	$	10,243

Total Expected Future Amortization Expense for Acquired Intangible Assets

As of December 31, 2019, the total expected future amortization expense of acquired intangible assets by year is as follows (in thousands):

2020	$	10,443
2021	10,197
2022	8,202
2023	7,709
Thereafter	12,607
Total expected future amortization expense	$	49,158