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Balance Sheet Components | 3 Months Ended
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Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Balance Sheet Components | Balance Sheet Components 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 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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