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Financial Statement Components
 6 Months Ended
Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Financial Statement Components
Note 3. Financial Statement Components
Cash and cash equivalents consisted of the following (in thousands):
June 30, 2022December 31, 2021
Cash$83,919 $91,499 
Money market funds222,578 175,663 
Total cash and cash equivalents$306,497 $267,162 
As of June 30, 2022, $5.5 million in the cash balance above represents restricted cash, which is held in the form of a bank deposit for issuance of a foreign bank guarantee.
Accounts receivable, net consisted of the following (in thousands):
June 30, 2022December 31, 2021
Accounts receivable$196,941 $193,192 
Unbilled accounts receivable66,567 47,676 
Allowance for doubtful accounts(9,937)(8,026)
Accounts receivable, net$253,571 $232,842 
Prepaid expenses and other current assets consisted of the following (in thousands):
June 30, 2022December 31, 2021
Prepaid expenses$28,490 $26,254 
Inventory4,564 5,655 
Other current assets19,322 16,256 
Total prepaid expenses and other current assets$52,376 $48,165 
Property and equipment, net consisted of the following (in thousands):
June 30, 2022December 31, 2021
Computer hardware and software$209,455 $197,395 
Internal-use software development costs170,671 140,424 
Furniture and fixtures8,838 8,660 
Leasehold improvements13,713 13,533 
Total property and equipment, gross402,677 360,012 
Less: accumulated depreciation and amortization(224,437)(193,102)
Property and equipment, net$178,240 $166,910 
Total depreciation and amortization expense related to property and equipment was $17.6 million and $14.2 million for the three months ended June 30, 2022 and 2021, respectively, and $34.5 million and $27.2 million for the six months ended June 30, 2022 and 2021, respectively.
The carrying value of goodwill is as follows (in thousands):
Balance at December 31, 2021$55,490 
Foreign currency translation adjustments(1,710)
Balance at June 30, 2022$53,780 
The carrying values of intangible assets are as follows (in thousands):
June 30, 2022December 31, 2021
Weighted-Average Remaining Useful LifeCostAccumulated
Amortization		Acquired
Intangibles, Net		CostAccumulated
Amortization		Acquired
Intangibles, Net
Customer relationships
1.1 years
$20,625 $17,088 $3,537 $21,333 $15,725 $5,608 
Developed technology
4.2 years
814,576 189,554 625,022 814,873 103,875 710,998 
Total acquired intangible assets$835,201 $206,642 $628,559 $836,206 $119,600 $716,606 
Amortization expense from acquired intangible assets for the three months ended June 30, 2022 and 2021 was $43.7 million and $12.0 million, respectively, and $87.7 million and $23.6 million for the six months ended June 30, 2022 and 2021, respectively. Amortization of developed technology is included in cost of revenues and amortization of customer relationships is included in sales and marketing expenses in the Condensed Consolidated Statements of Operations.
Estimated amortization expense for acquired intangible assets for the following fiscal years is as follows (in thousands):
2022 (remaining)$84,910 
2023150,543 
2024147,102 
2025132,932 
2026 onwards113,072 
Total estimated amortization expense$628,559 
Accrued liabilities consisted of the following (in thousands):
June 30, 2022December 31, 2021
Accrued compensation and benefits$47,439 $48,911 
Accrued sales, use, and telecom related taxes36,458 30,463 
Accrued marketing55,243 52,547 
Operating lease liabilities, short-term17,875 18,686 
Other accrued expenses161,257 129,191 
Total accrued liabilities$318,272 $279,798 
Deferred and Prepaid Sales Commission Costs
Amortization expense for the deferred and prepaid sales commission costs was $26.9 million and $17.8 million for the three months ended June 30, 2022 and 2021, respectively, and $50.1 million and $33.4 million for the six months ended June 30, 2022 and 2021, respectively. There was no impairment loss in relation to the costs capitalized for the periods presented.