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Revenue and Receivables from Contracts with Customers (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]    
Schedule of Disaggregation of Revenue The following table disaggregates the Company’s revenue between over time and point in time recognition:
Three Months Ended
September 30,		Nine Months Ended
September 30,
2021202020212020
Over time$167,981 $113,246 $562,286 $314,060 
Point in time9,446 9,598 40,463 15,781 
Total revenues$177,427 $122,844 $602,749 $329,841 
 The following table disaggregates the Company’s revenue between over time and point in time recognition:
Year Ended December 31,
202020192018
Over time$494,295 $503,052 $654,164 
Point in time24,691 30,245 47,825 
Total revenues$518,986 $533,297 $701,989 
Schedule of Allowance for Credit Losses
The allowance for credit losses activity for the three and nine months ended September 30, 2021 and 2020 is as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
2021202020212020
Beginning balance (1)
$1,104 $1,087 $1,045 $1,923 
Bad debt expense916 3,099 290 2,853 
Write-offs(18)(38)(46)(596)
Recoveries— 197 710 197 
Foreign currency translation and other adjustments(1)(18)2 (50)
Ending balance$2,001 $4,327 $2,001 $4,327 
__________________
(1)Beginning balance for the nine months ended September 30, 2020 includes the cumulative adjustment of $0.2 million, which reflects the increase in the Company’s allowance for credit losses upon adoption of ASU 2016-13 and the CECL model on January 1, 2020.
The allowance for credit losses activity for the years ended December 31, 2020, 2019, and 2018 is as follows:
Year Ended December 31,
202020192018
Beginning Balance(1)
$1,924 $— $— 
Bad debt expense2,991 2,270 400 
Write-offs(3,588)(540)(400)
Foreign currency translation and other adjustments(282)6 — 
Ending Balance$1,045 $1,736 $— 
__________________
(1)Beginning balance for the year ended December 31, 2020 includes the cumulative adjustment of $0.2 million which reflects the increase in the Company’s Allowance for Credit Losses as a result of the use of the current expected credit loss model related to the adoption of ASU 2016-13 on January 1, 2020. See Note 2 Summary of Significant Accounting Policies for further information.