Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities - Warranty Costs (Details)

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Accrued Liabilities - Warranty Costs (Details) - Warranty - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Accrued Liabilities, Rollforward [Roll Forward]        
Beginning Balance $ 232 $ 204    
Additions for estimated future expense 362 207    
Incurred costs (287) (179)    
Closing Balance 307 232    
Current portion     $ 295 $ 232
Long-term portion     12 0
Total $ 232 $ 204 $ 307 $ 232