Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities - Product Maintenance and Warranty (Details)

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Accrued Liabilities - Product Maintenance and Warranty (Details) - Warranty - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Accrued Liabilities, Rollforward [Roll Forward]    
Beginning Balance $ 226  
Additions for estimated future expense 46  
Incurred costs (77)  
Closing Balance 195  
Current portion   $ 153
Long-term portion   42
Total $ 195 $ 195