Annual report pursuant to Section 13 and 15(d)

Quarterly Results of Operations (Unaudited) - Effect of Adoption of ASC 606 on Net Sales (Details)

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Quarterly Results of Operations (Unaudited) - Effect of Adoption of ASC 606 on Net Sales (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net sales $ 49,055 $ 47,923 $ 43,914 $ 40,552 $ 44,437 $ 39,018 $ 39,021 $ 38,091 $ 181,444 $ 160,567 $ 164,609
ASU 2014-09 | As Reported                      
Net sales         126,956 106,646 102,982 112,795   449,379 418,131
ASU 2014-09 | Impact of Adoption                      
Net sales         $ (82,519) $ (67,628) $ (63,961) $ (74,704)   $ (288,812) $ (253,522)