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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):

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Three Months Ended June 30, 

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Six Months Ended June 30, 

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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