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Stock-based compensation (Tables)
9 Months Ended
Sep. 30, 2022
Stock-based compensation  
Summary of share-based compensation expense for all stock awards

Stock-based compensation expense for all stock awards consists of the following (in thousands):

Three Months Ended September 30, 

Nine Months Ended September 30, 

2022

    

2021

    

2022

    

2021

Cost of product revenue

$

199

$

96

$

424

$

282

Cost of service and other revenue

 

159

 

115

 

530

 

347

Research and development

 

320

 

440

 

1,200

 

1,248

Selling, general, and administrative

 

2,088

 

3,357

 

9,625

 

9,167

Total stock-based compensation

$

2,766

$

4,008

$

11,779

$

11,044