Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities - Product Maintenance and Warranty (Details)

v3.19.3
Accrued Liabilities - Product Maintenance and Warranty (Details) - September 30, 2019 - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accrued Liabilities, Rollforward [Roll Forward]        
Beginning Balance $ 294 $ 311 $ 307 $ 232
Additions for estimated future expense 113 99 293 312
Incurred costs (100) (110) (293) (244)
Closing Balance $ 307 $ 300 $ 307 $ 300