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
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Accrued Liabilities, Rollforward [Roll Forward]  
Beginning Balance $ 307
Additions for estimated future expense 95
Incurred costs (113)
Closing Balance $ 289