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Warranties
12 Months Ended
Dec. 31, 2018
Warranties Disclosure [Abstract]  
Warranties Disclosure [Text Block]

11. Warranties

Warranties are estimated and accrued at the time revenues are recorded. A rollforward of the Company’s product warranty accrual is as follows:

Beginning(Payments)\Ending
BalanceCreditsAdditionsBalance
(in thousands)
Year ended December 31, 2017$193(7)60$246
Year ended December 31, 2018$246(37)182$391