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Revenues
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenues Revenues
    
The following tables present revenue disaggregated by primary geographic market where the products are sold, by product line and timing of revenue recognition:
Three Months EndedThree Months Ended
September 30, 2021September 30, 2020
 Orthopedic SurgeryGeneral SurgeryTotalOrthopedic SurgeryGeneral SurgeryTotal
Primary Geographic Markets
United States$37,957 $98,444 $136,401 $38,913 $95,292 $134,205 
Europe, Middle East & Africa24,155 19,905 44,060 23,104 17,584 40,688 
Asia Pacific27,517 16,113 43,630 26,403 15,405 41,808 
Americas (excluding the United States)16,122 8,614 24,736 13,767 7,367 21,134 
Total sales from contracts with customers$105,751 $143,076 $248,827 $102,187 $135,648 $237,835 
Timing of Revenue Recognition
Goods transferred at a point in time$96,389 $141,798 $238,187 $93,000 $134,745 $227,745 
Services transferred over time9,362 1,278 10,640 9,187 903 10,090 
Total sales from contracts with customers$105,751 $143,076 $248,827 $102,187 $135,648 $237,835 

Nine Months EndedNine Months Ended
September 30, 2021September 30, 2020
Orthopedic SurgeryGeneral SurgeryTotalOrthopedic SurgeryGeneral SurgeryTotal
Primary Geographic Markets
United States$115,864 $288,069 $403,933 $97,339 $243,137 $340,476 
Europe, Middle East & Africa77,327 58,594 135,921 62,726 50,345 113,071 
Asia Pacific80,403 44,911 125,314 66,737 34,211 100,948 
Americas (excluding the United States)47,215 24,282 71,497 35,152 19,984 55,136 
Total sales from contracts with customers$320,809 $415,856 $736,665 $261,954 $347,677 $609,631 
Timing of Revenue Recognition
Goods transferred at a point in time$291,728 $412,298 $704,026 $237,224 $345,068 $582,292 
Services transferred over time29,081 3,558 32,639 24,730 2,609 27,339 
Total sales from contracts with customers$320,809 $415,856 $736,665 $261,954 $347,677 $609,631 

Contract liability balances related to the sale of extended warranties to customers are as follows:

September 30, 2021December 31, 2020
Contract liability$15,833 $13,666 
    
Revenue recognized during the nine months ended September 30, 2021 and September 30, 2020 from amounts included in contract liabilities at the beginning of the period were $8.4 million and $7.6 million, respectively. There were no material contract assets as of September 30, 2021 and December 31, 2020.