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Segments - Summary of Net Sales and Long-Lived Assets (Detail) - 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
Segment Reporting Information [Line Items]                      
Net sales $ 233,224 $ 176,915 $ 138,723 $ 137,211 $ 169,474 $ 142,812 $ 104,746 $ 99,052 $ 686,073 $ 516,084 $ 426,717
Total long-lived assets 48,571       44,696       48,571 44,696  
United States [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 466,044 376,087 352,436
Total long-lived assets 23,781       24,637       23,781 24,637  
International [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 220,029 139,997 $ 74,281
China and Viet Nam [Member]                      
Segment Reporting Information [Line Items]                      
Total long-lived assets 20,662       18,865       20,662 18,865  
United Kingdom [Member]                      
Segment Reporting Information [Line Items]                      
Total long-lived assets $ 4,128       $ 1,194       $ 4,128 $ 1,194