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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Property Plant And Equipment [Abstract]  
Summary of Property, Plant and Equipment

Property, plant and equipment consisted of the following:

 

 

 

 

December 31,

 

 

 

2019

 

 

2018

 

Research equipment

 

$

6,522

 

 

$

7,313

 

Office furniture and equipment

 

 

985

 

 

 

1,046

 

Computer equipment

 

 

2,473

 

 

 

2,461

 

Leasehold improvements

 

 

6,370

 

 

 

6,370

 

Less: accumulated depreciation and amortization

 

 

(14,690

)

 

 

(16,199

)

Net book value

 

$

1,660

 

 

$

991