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Consolidated balance sheet components
9 Months Ended
Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Consolidated balance sheet components
5. Consolidated balance sheet components

Cash, cash equivalents, and marketable securities The amortized cost, unrealized gains and losses, and estimated fair value of cash, cash equivalents, and marketable securities consisted of the following (in thousands):
As of September 30, 2022
Amortized costUnrealized GainsUnrealized LossesFair Value
Cash and cash equivalents:
Cash$418,993 $— $— $418,993 
Money market funds1,457 — — 1,457 
U.S. government securities7,463 — 7,464 
Total cash and cash equivalents427,913 — 427,914 
Marketable securities:
U.S. government securities66,267 — (215)66,052 
Total cash, cash equivalents, and marketable securities$494,180 $$(215)$493,966 

The Company periodically evaluates its investments for other-than-temporary declines in fair value. The unrealized losses on available-for-sale securities were primarily due to unfavorable changes in interest rates subsequent to the initial purchase of these securities. No securities had been in a continuous unrealized loss position for twelve months or longer as of September 30, 2022. The Company expects to recover the full carrying value of its available-for-sale securities in an unrealized loss position as it does not intend or anticipate a need to sell these securities prior to recovering the associated unrealized losses. As a result, the Company does not consider any portion of the unrealized losses as of September 30, 2022 to represent an other-than temporary impairment.

As of September 30, 2022, the entirety of the Company’s marketable securities portfolio had contractual maturities of one year or less.
Prepaid expenses and other current assets— Prepaid expenses and other current assets consisted of the following (in thousands):
September 30,December 31,
20222021
Prepaid expenses$9,904 $12,465 
Capitalized cloud computing costs, current913 808 
Short term deposits115 745 
Other current assets2,546 1,909 
Prepaid expenses and other current assets$13,478 $15,927 
Property and equipment, net— Property and equipment, net consisted of the following (in thousands):
September 30,December 31,
20222021
Computers and equipment$7,843 $6,798 
Furniture and fixtures4,843 4,701 
Purchased software383 383 
Leasehold improvements19,045 18,932 
Construction in progress18 18 
Total property and equipment32,132 30,832 
Less accumulated depreciation and amortization(24,316)(20,945)
Property and equipment, net$7,816 $9,887 
Depreciation expense was $1.1 million for both the three months ended September 30, 2022 and 2021, and $3.4 million and $3.3 million for the nine months ended September 30, 2022 and 2021, respectively.
Capitalized software, net— Capitalized software, net consisted of the following (in thousands):
September 30,December 31,
20222021
Capitalized software$58,637 $43,804 
Less accumulated amortization(32,750)(23,750)
Capitalized software, net$25,887 $20,054 
Amortization expense of capitalized software was $3.3 million and $2.5 million for the three months ended September 30, 2022 and 2021, respectively, and $9.0 million and $6.7 million for the nine months ended September 30, 2022 and 2021, respectively.

As of September 30, 2022, expected amortization expense for capitalized software over the remaining asset lives is as follows (in thousands):

Remainder of 2022$3,445 
202312,272 
20247,947 
20252,223 
Total expected amortization$25,887