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Balance Sheet Components
 12 Months Ended
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Balance Sheet Components Balance Sheet Components
Accounts Receivable and Allowance for Doubtful Accounts
Our accounts receivable represent amounts invoiced and due from our customers (including, for the avoidance of doubt, resellers and managed service providers) under our revenue contracts. The activity in the allowance for doubtful accounts was as follows (in thousands):
20212020
Beginning balance$437 $650 
(Reversal of) Provision for allowance for doubtful accounts(95)364 
Write offs(218)(592)
Impacts of foreign currency translation39 15 
Ending balance$163 $437 
Prepaid and Other Current Assets
Our prepaid and other current assets consisted of the following as of December 31, 2021 and 2020 (in thousands):
20212020
Prepaid expenses$4,247 $1,640 
Withholding taxes394 336 
Deferred costs1,555 — 
Other current assets— 36 
Total6,196 2,012 
Property and Equipment, Net
Our property and equipment, net consisted of the following as of December 31, 2021 and 2020 (in thousands):
20212020
Leasehold improvements$4,225 $5,241 
Equipment and fixtures4,233 2,856 
8,458 8,097 
Less: accumulated depreciation and amortization(6,343)(6,268)
Property and equipment, net$2,115 $1,829 
During 2021 and 2020, we recognized depreciation and amortization expense on property and equipment of $0.7 million and $0.5 million, respectively.