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Business Segment Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
item
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Segment Information                      
Number of business activities | item                 1    
Number of operating segments | segment                 1    
Total net sales $ 65,849 $ 58,509 $ 58,600 $ 54,026 $ 54,076 $ 43,908 $ 43,161 $ 40,133 $ 236,984 $ 181,278 $ 159,254
Property and equipment, net 22,056       19,153       22,056 19,153 11,794
Depreciation and amortization                 6,306 6,264 5,482
Capital expenditures                 4,725 10,315 6,272
United States                      
Business Segment Information                      
Total net sales                 192,456 151,677 140,902
Property and equipment, net 21,932       19,040       21,932 19,040 11,677
Depreciation and amortization                 6,273 6,234 5,406
Capital expenditures                 4,681 10,288 6,051
International                      
Business Segment Information                      
Total net sales                 44,528 29,601 18,352
Property and equipment, net $ 124       $ 113       124 113 117
Depreciation and amortization                 33 30 76
Capital expenditures                 $ 44 $ 27 $ 221