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Property and Equipment, net
 6 Months Ended
Jun. 30, 2022
Property, Plant and Equipment [Abstract]  
Property and Equipment, net

6. Property and Equipment, net

Property and equipment, net consist of the following (in thousands, except as indicated):

 

 

 

Useful lives
(in years)

 

June 30,
2022

 

 

December 31,
2021

 

Surgical instruments

 

4

 

$

145,123

 

 

$

130,432

 

Machinery and equipment

 

7

 

 

10,985

 

 

 

11,092

 

Computer equipment

 

3

 

 

5,500

 

 

 

5,694

 

Office furniture and equipment

 

5

 

 

4,316

 

 

 

3,861

 

Leasehold improvements

 

various

 

 

3,404

 

 

 

1,754

 

Construction in progress

 

n/a

 

 

14,591

 

 

 

7,292

 

 

 

 

 

 

183,919

 

 

 

160,125

 

Less: accumulated depreciation
   and amortization

 

 

 

 

(84,736

)

 

 

(72,724

)

Property and equipment, net

 

 

 

$

99,183

 

 

$

87,401

 

 

Total depreciation expense was $7.5 million and $14.6 million for the three and six months ended June 30, 2022, respectively, and $5.0 million and $8.4 million for three and six months ended June 30, 2021, respectively. Construction in progress is not depreciated until placed in service. Property and equipment includes assets under financing leases and the related amortization of assets under financing leases is included in depreciation expense. Construction in progress includes costs associated with internal-use software.