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Revenues
 12 Months Ended
Dec. 31, 2020
Revenues [Abstract]  
Revenue from Contract with Customer Revenues
The following tables present revenue disaggregated by product line and timing of revenue recognition for the years ended December 31, 2020, 2019 and 2018:

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 
2018
 Orthopedic SurgeryGeneral SurgeryTotal
Timing of Revenue Recognition
Goods transferred at a point in time$413,630 $411,391 $825,021 
Services transferred over time33,098 1,515 34,613 
Total sales from contracts with customers$446,728 $412,906 $859,634 

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, 2020December 31, 2019
Contract Liability$13,666 $14,276 

Revenue recognized during years ended December 31, 2020, 2019 and 2018 from amounts included in contract liabilities at the beginning of the period were $9.3 million, $6.8 million and $5.0 million, respectively. There were no material contract assets as of December 31, 2020 and December 31, 2019.