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Revenue and Geographic Information (Tables)
 9 Months Ended
Sep. 24, 2021
Revenue from Contract with Customer [Abstract]  
Summary of Changes in Deferred Revenue The following table represents the changes in deferred revenue for the nine months ended September 24, 2021, and September 25, 2020:
Nine Months Ended
September 24,
2021		September 25,
2020
Deferred revenue – beginning of period
$30,466 $23,820 
Amounts billed, but not recognized
20,971 20,515 
Recognition of revenue
(20,168)(15,978)
Deferred revenue acquired1,469 — 
Deferred revenue – end of period
$32,738 $28,357 
Disaggregation of Revenue The following table sets forth revenue from the United States and all international dealers and distributors for the three months and nine months ended September 24, 2021 and September 25, 2020:
Three Months Ended Nine Months Ended
September 24,
2021		September 25,
2020		September 24,
2021		September 25,
2020
United States
$227,561 $199,289 $645,459 $523,100 
International
33,185 26,987 89,060 64,906 
Total
$260,746 $226,276 $734,519 $588,006 

Additionally, the Company’s revenue includes amounts recognized over time and at a point in time, and are as follows for the three months and nine months ended September 24, 2021, and September 25, 2020:


Three Months Ended Nine Months Ended
September 24,
2021		September 25,
2020		September 24,
2021		September 25,
2020
Products transferred at a point in time
$254,170 $221,306 $714,351 $572,028 
Services transferred over time
6,576 4,970 20,168 15,978 
Total
$260,746 $226,276 $734,519 $588,006 
Schedule of Accounts Receivable
As of September 24, 2021, and December 25, 2020, the Company’s accounts receivable, net consisted of the following:


September 24,
2021		December 25,
2020
Accounts receivable
$56,455 $51,716 
Allowance for doubtful accounts
(2,336)(2,353)
Accounts receivable, net
$54,119 $49,363