Balance Sheet Components

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Accounts Receivable, Net

As of March 31, 2021 and December 31, 2020, the Company’s allowance for doubtful accounts was $2.1 million and $1.7 million, respectively. Bad debt expense for the three months ended March 31, 2021 and 2020 was $1.4 million and $2.2 million, respectively. For the three months ended March 31, 2021 and 2020, write-off of uncollectible accounts receivable was $1.0 million and $0.5 million, respectively.

Property and Equipment, Net

Property and equipment, net consisted of the following:


	March 31, 2021		December 31, 2020

	(in thousands)
Property and equipment:
Servers—network infrastructure	$	115,944	$	108,988
Construction in progress	22,135		11,242
Capitalized internal-use software	53,723		49,618
Office and computer equipment	20,721		17,867
Office furniture	5,604		5,657
Software	2,569		1,808
Leasehold improvements	10,686		10,686
Asset retirement obligation	430		430
Gross property and equipment	231,812		206,296
Less accumulated depreciation and amortization	(96,017)		(82,608)
Total property and equipment, net	$	135,795	$	123,688

Depreciation and amortization expense on property and equipment for the three months ended March 31, 2021 and 2020 was $14.0 million and $9.9 million, respectively. This includes amortization expense for capitalized internal-use software which totaled $4.2 million and $2.5 million for the three months ended March 31, 2021 and 2020, respectively.

Goodwill

As of March 31, 2021 and December 31, 2020, the Company's goodwill was $17.2 million. No goodwill impairments were recorded during the three months ended March 31, 2021 and 2020.

Acquired Intangible Assets, Net

Acquired intangible assets, net consisted of the following:


	March 31, 2021
	Gross Carrying Amount		Accumulated Amortization		Net Book Value

	(in thousands)
Developed technology	$	5,600	$	3,500	$	2,100
Total acquired intangible assets, net	$	5,600	$	3,500	$	2,100


	December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Book Value

	(in thousands)
Developed technology	$	5,600	$	2,800	$	2,800
Total acquired intangible assets, net	$	5,600	$	2,800	$	2,800

Amortization of acquired intangible assets for the three months ended March 31, 2021 and 2020 was $0.7 million and $0.7 million, respectively.

As of March 31, 2021, the estimated future amortization expense of acquired intangible assets was as follows:


	Estimated Amortization
	(in thousands)
Year ending December 31,
2021	2,100
Total	$	2,100