Annual report pursuant to Section 13 and 15(d)

Schedule II Valuation and Qualifying Accounts (Details)

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Schedule II Valuation and Qualifying Accounts (Details) - Inventory reserves - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 676 $ 697 $ 966
Charged to (Reduction of) Cost and Expenses 1,767 1,828 1,237
Deductions (1,696) (1,849) (1,506)
Balance at End of Period $ 747 $ 676 $ 697