Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

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 Ended
	March 31, 2018
	Orthopedic Surgery		General Surgery		Total
Primary Geographic Markets
United States	$	43,152	$	63,099	$	106,251
Americas (excluding the United States)	16,771		7,679		24,450
Europe, Middle East & Africa	28,302		12,984		41,286
Asia Pacific	20,637		9,440		30,077
Total sales from contracts with customers	$	108,862	$	93,202	$	202,064
Timing of Revenue Recognition
Goods transferred at a point in time	$	106,664	$	92,881	$	199,545
Services transferred over time	2,198		321		2,519
Total sales from contracts with customers	$	108,862	$	93,202	$	202,064

	Three Months Ended
	March 31, 2017
	Orthopedic Surgery		General Surgery		Total
Primary Geographic Markets
United States	$	42,391	$	57,037	$	99,428
Americas (excluding the United States)	13,618		6,822		20,440
Europe, Middle East & Africa	26,650		11,789		38,439
Asia Pacific	21,130		7,130		28,260
Total sales from contracts with customers	$	103,789	$	82,778	$	186,567
Timing of Revenue Recognition
Goods transferred at a point in time	$	101,804	$	82,662	$	184,466
Services transferred over time	1,985		116		2,101
Total sales from contracts with customers	$	103,789	$	82,778	$	186,567

Contract with Customer, Asset and Liability

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

	March 31, 2018		December 31, 2017
Contract liability	$	9,351	$	7,786