Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities - Schedule of Warranty Costs (Details)

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Accrued Liabilities - Schedule of Warranty Costs (Details) - Warranty - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Accrued Liabilities, Rollforward [Roll Forward]        
Balance at beginning of the period $ 319 $ 232    
Additions for estimated future expense 416 374    
Incurred costs (385) (287)    
Balance at end of the period 350 319    
Current portion     $ 285 $ 255
Long-term portion     65 64
Total $ 350 $ 319 $ 350 $ 319