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Stock-based compensation (Tables)
6 Months Ended
Jun. 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 June 30, 

Six Months Ended June 30, 

2022

    

2021

    

2022

    

2021

Cost of product revenue

$

137

$

96

$

225

$

186

Cost of service and other revenue

 

205

 

122

 

371

 

232

Research and development

 

482

 

409

 

880

 

808

Selling, general, and administrative

 

4,362

 

3,023

 

7,537

 

5,810

Total

$

5,186

$

3,650

$

9,013

$

7,036