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Revenues
 12 Months Ended
Dec. 31, 2021
Revenues [Abstract]  
Revenues Revenues
The following tables present revenue disaggregated by product line and timing of revenue recognition for the years ended December 31, 2021, 2020 and 2019:

2021
 Orthopedic SurgeryGeneral SurgeryTotal
Timing of Revenue Recognition
Goods transferred at a point in time$398,963 $567,244 $966,207 
Services transferred over time39,461 4,967 44,428 
Total sales from contracts with customers$438,424 $572,211 $1,010,635 

2020
 Orthopedic SurgeryGeneral SurgeryTotal
Timing of Revenue Recognition
Goods transferred at a point in time$340,318 $484,147 $824,465 
Services transferred over time34,387 3,607 37,994 
Total sales from contracts with customers$374,705 $487,754 $862,459 
2019
 Orthopedic SurgeryGeneral SurgeryTotal
Timing of Revenue Recognition
Goods transferred at a point in time$426,893 $489,313 $916,206 
Services transferred over time36,429 2,462 38,891 
Total sales from contracts with customers$463,322 $491,775 $955,097 

Revenue disaggregated by primary geographic market where the products are sold is included in Note 11.
    
Contract liability balances related to the sale of extended warranties to customers are as follows:

December 31, 2021December 31, 2020
Contract Liability$16,760 $13,666 

Revenue recognized during years ended December 31, 2021, 2020 and 2019 from amounts included in contract liabilities at the beginning of the period were $10.3 million, $9.3 million and $6.8 million, respectively. There were no material contract assets as of December 31, 2021 and December 31, 2020.