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
6 Months Ended
Jun. 30, 2019
USD ($)
Accrued Liabilities, Rollforward [Roll Forward]  
Beginning Balance $ 307
Additions for estimated future expense 180
Incurred costs (193)
Closing Balance $ 294