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Property and Equipment (Tables)
 9 Months Ended
Sep. 30, 2020
Property Plant And Equipment [Abstract]  
Property and Equipment, Net

Property and equipment, net, as of September 30, 2020 and December 31, 2019 consisted of the following:

 

 

 

Estimated

 

September 30,

 

 

December 31,

 

 

 

Useful Life

 

2020

 

 

2019

 

Lab and test equipment

 

7 years

 

$

17,755

 

 

$

14,810

 

Vehicles

 

5 years

 

 

12,869

 

 

 

11,073

 

Equipment

 

3–7 years

 

 

31,539

 

 

 

29,922

 

Furniture and fixtures

 

7 years

 

 

2,854

 

 

 

1,119

 

Leasehold improvements

 

7 years

 

 

6,758

 

 

 

5,954

 

Aircraft

 

10 years

 

 

834

 

 

 

—

 

Building

 

39 years

 

 

2,975

 

 

 

—

 

 

 

 

 

 

75,584

 

 

 

62,878

 

Land

 

 

 

 

725

 

 

 

—

 

Construction in progress

 

 

 

 

156

 

 

 

796

 

Less accumulated depreciation

 

 

 

 

(41,906

)

 

 

(36,638

)

Total property and equipment—net

 

 

 

$

34,559

 

 

$

27,036