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Property and Equipment, Net
 9 Months Ended
Sep. 30, 2021
Property Plant And Equipment [Abstract]  
Property and Equipment, Net . Property and Equipment, net

Property and equipment, net consisted of the following (in thousands):

 

 

 

Useful life
(in years)

 

September 30,
2021

 

 

December 31,
2020

 

Laboratory equipment

 

3

 

$

5,502

 

 

$

4,350

 

Leasehold improvements

 

Lesser of useful life or lease term

 

 

1,614

 

 

 

1,427

 

Furniture and fixtures

 

3

 

 

303

 

 

 

524

 

Construction in progress

 

 —

 

 

9,402

 

 

 

1,090

 

Computer equipment

 

3

 

 

217

 

 

 

93

 

Software

 

3

 

 

320

 

 

 

170

 

 

 

 

 

 

17,358

 

 

 

7,654

 

Less: Accumulated depreciation and amortization

 

 

 

 

(5,963

)

 

 

(4,864

)

Property and equipment, net

 

 

 

$

11,395

 

 

$

2,790

 

 

Depreciation and amortization expense was $0.4 million and $0.3 million for the three months ended September 30, 2021 and 2020, respectively. Depreciation and amortization expense was $1.2 million and $0.9 million for the nine months ended September 30, 2021 and 2020, respectively. Construction in progress has increased by $6.8 million and $9.4 million in the three and nine months ended September 30, 2021, due to building construction related to the Company's leased space in

Redwood City. Construction in process will continue to increase through the first half of 2022, upon completion of the construction.