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Other Financial Statement Information (Tables)
9 Months Ended
Sep. 30, 2021
Other Financial Information [Abstract]  
Summary of Changes in the Allowance
Changes in the allowance consisted of the following (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Beginning balance$5,114 $2,447 $5,256 $2,461 
Add: amounts recognized as a reduction of revenue1,884 1,487 4,911 4,300 
Add: bad debt expense recognized in general and administrative expense146 348 177 1,028 
Less: write-offs, net of recoveries(2,415)(720)(5,615)(4,227)
Ending balance$4,729 $3,562 $4,729 $3,562 
Summary of Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in thousands):
September 30, 2021December 31, 2020
Prepaid expenses$11,221 $7,177 
Deferred cost of revenue2,369 1,967 
Other current assets2,748 1,392 
Total prepaid expenses and other current assets$16,338 $10,536 
Summary of Accrued Expenses and Other Current Liabilities
Accrued expenses and other current liabilities consisted of the following (in thousands):
September 30, 2021December 31, 2020
Accrued payroll and related expenses$17,740 $16,135 
Accrued vendor payables16,010 10,854 
Derivative liabilities and hybrid debt— 5,131 
Sales allowances4,952 4,856 
Accrued sales, use and business taxes1,711 1,789 
Other2,545 2,263 
Total accrued expenses and other current liabilities$42,958 $41,028 
Summary of Depreciation and Amortization Expense
Depreciation and amortization expense of our property and equipment, including capitalized internal-use software, and intangible assets consisted of the following (in thousands):
 Three Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
Cost of revenue$1,403 $1,904 $4,479 $5,796 
Sales and marketing1,401 1,377 4,199 4,988 
Technology and development538 656 1,709 1,973 
General and administrative433 478 1,217 1,405 
Total depreciation and amortization expense$3,775 $4,415 $11,604 $14,162