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Other Current Liabilities - Allowance for sales discounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Current Liabilities      
Balance at beginning of year $ 896 $ 494 $ 1,203
Charges to earnings 8,791 6,448 1,855
Amounts utilized (8,878) (6,046) (2,564)
Balance at end of year $ 809 $ 896 $ 494