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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2018
Property Plant And Equipment [Abstract]  
Property, Plant and Equipment

7.

Property, plant and equipment:

Property, plant and equipment consisted of the following:

 

 

 

December 31,

 

 

 

2018

 

 

2017

 

Research equipment

 

$

7,313

 

 

$

6,984

 

Office furniture and equipment

 

 

1,046

 

 

 

1,043

 

Computer equipment

 

 

2,461

 

 

 

2,311

 

Leasehold improvements

 

 

6,370

 

 

 

6,370

 

Less: accumulated depreciation and amortization

 

 

(16,199

)

 

 

(15,638

)

Net book value

 

$

991

 

 

$

1,070